The question mark is there because I'm a little surprised--though not completely surprised. (Also, I know it kind of seems like I'm rubbing salt in his finger or something, but sometimes you can't help but notice things at the wrong time.
I was going to write about Adam Everett, since I advocated acquiring him in the offseason and so far he's given the Twins jack squat. And I'll get to that in a second.
But what I really wanted to emphasize was that defense has been a problem for the Twins (and I'm hardly the first person to point this out around here.) I thought that I would probably wind up arguing that Casilla was an average defender, so it would be tough for the Twins to improve much by replacing him defensively, but then the silly facts got in the way of my thoughts. Here's a list of RZR for qualified second basemen this year:
.903 -- Mark Ellis
.835 -- Robinson Cano
.833 -- Placido Polanco
.831 -- Grudz
.823 -- Pedroia
.815 -- Roberts
.800 -- Lopez
.799 -- Kinsler
.799 -- Iwamura
Now, the first thing that stands out to me in that list is that Mark Ellis is lapping everyone else at second base in the AL. Just smoking them. It's almost like when Tiger Woods won the 2000 Masters by shooting 12 under par while the runners up shot 3 over par. That's just a huge, huge gap.
Everyone else is pretty closely bunched around .815. (If you include the NL, almost the only difference is that Brandon Phillips is pretty good at .863, but otherwise you still basically have a clump of guys from .800 to .830.) Now, let's take a look at Twins second basemen who have had at least 150 balls-in-zone in some season from 2004-8:
.847 -- Punto, 2005
.831 -- Castillo, 2006
.801 -- Castillo, 2007
.789 -- Rivas, 2004
.768 -- Casilla, 2008
And, well, that doesn't look so great for Casilla, does it? Now, that's only 151 BIZ, which is really a very small sample size, so that's another reason for the question mark on the title of this post. But it's not exactly making me feel good about his defense. Also, in 2007, Casilla had a .784 RZR with 134 BIZ. Somewhat better, but still bad.
RZR isn't everything, but it's just about all the fielding information I know of for Casilla. The only other bit that I've run across is Dan Fox's* Simple Fielding Runs--a stat he devised while he was at Baseball Prospectus. SFR had Casilla down as 4.5 runs below average (on ~150 plays) at second base in Rochester last year, and 5.1 runs below average (on ~150 plays) at shortstop. For reference, Luis Rivas was at 5.4 runs below average (on ~190 plays) at second base and 6.6 runs below average (on ~250 plays) at shortstop.
*Dan now has a position as a sort of data consultant for the Pirates' new front office, if memory serves.
Also potentially of note, SFR had Deibinson Romero as the best infielder in the 2007 Appy league, at 13 runs above average on about 185 plays.
Anyway, all of the data I have points to Casilla being below average as a defender. When I watch him play, I am unimpressed. Yes, he's got some speed, but I don't feel like he gets great jumps on the ball, or plays deep enough to get to a lot of stuff up the middle or in the hole. He also doesn't seem to have great hands and has a decent but not great arm. Plus, there are the mental lapses. As much as we might think that they will go away with more experience, I don't think that that is necessarily a good assumption.
The Hardball Times has the Twins at -16 runs on defense overall, which puts them about even with the Tigers, but ahead of Seattle, KC, and Texas. (Holy crap do KC and Texas have awful fielding numbers.) When you break it down between infield and outfield contributions, the outfield is below average (.829) at an .821 RZR, but not by a ton, and their out-of-zone plays are pretty close to average. The infield, though, has the worst RZR in the AL, and the second-fewest out-of-zone plays. So if we're going to point to a defensive weakness, it's gotta be in the infield somewhere.
Certainly, I can't imagine that Brendan Harris has been helping matters whatsoever, SSS RZR at 2B notwithstanding, he's been a defensive disaster basically everywhere he's gone. Mike Lamb was pretty awful at 3B (just as bad as Batista in 2006 by most measures I can find), so getting him out of the mix helps. Buscher has been better, but it's been an improvement from awful to bad--Buscher has a .702 RZR compared to Lamb's nearly unfathomable .602, but .702 puts him at the back of the pack in the AL, with guys like Alex Gordon and Casey Blake. (Adrian Beltre's .707 RZR makes a bad first impression, but his 55 out-of-zone plays is far and away the best in the league. He's not the best fielding 3B in the AL, but he's above average.)
So that brings us to shortstop. I remember not many people being impressed with Adam Everett when he came up, and certainly his shoulder injury made his fielding look horrific at times. But, let's check the record:
.861 RZR, 79 BIZ -- Everett
.860 RZR, 86 BIZ -- Punto
.790 RZR, 119 BIZ -- Harris
At least going by RZR, Everett was as effective as Punto, and that was with a limp noodle for an arm. I have no idea what kind of shape is arm is in now, but I imagine that we will find out. .861 is pretty decent though, tops in the AL is .869 (from Captain Maybe I'll Actually Position Myself Where The Coaches Suggest) and second is Orlando Cabrera at .863.
My main impression of Adam Everett's fielding, though, is from Bill James' essay in John Dewan's The Fielding Bible on Jeter vs. Everett. If you can still find a cheap copy, I recommend it. Here's the part that seems most relevant to this discussion, where James is discussing the video he was given of Jeter's and Everett's 20 best and 20 worst plays:
That being said, watching Derek Jeter made 40 defensive plays and then watching Adam Everett make 40 defensive plays at the same position is sort of like watching video of Barbara Bush dancing at the White House, and then watching Demi Moore dancing in Striptease. The two men could not possibly be more different in the style and manner in which they run the office. Jeter, in 40 plays, had maybe three plays in which he threw with his feet set. He threw on the run about 20-25 times; he jumped and threw about 10-15 times, he threw from his knees once. He threw from a stable position only when the ball, by the way it was hit, pinned him back on his heels.
That you probably didn't need any special video sessions to realize--Jeter's a total drama queen out there.
Everett set his feet with almost unbelievable quickness and reliability, and threw off of his back foot on almost every play, good or bad. Jeter played much, much more shallow than Everett, cheated to his left more, and shifted his position from left to right much, much more than Everett did (with the exception of three plays on which Everett was shifted over behind second in a Ted Williams shift. Jeter had none of these.)
This sounds like something that's going to generally be tough to pick up by watching someone make 3-4 plays per game, but would be easier to notice watching 40 consecutive plays that Everett makes.
Jeter gambled constantly on forceouts, leading to good plays when he beat the runner, bad plays when he didn't. Everett gambled on a forceout only a couple of times, taking the out at first base unless the forceout was a safe play.
This makes it seem as though Everett is pretty conservative out there, though given how much he has dominated the defensive metrics in the past, making the sure out might not be sexy, but could be pretty good regardless.
Many or most of the good plays made by Jeter were plays made in the inield grass, slow rollers that could easily have died i nthe infield, but plays on which Jeter, playing shallow and charging the ball aggressively, was able to get the man at first. These were plays that would have been infield hits with most shortstops, and which almost certainly would have been infield hits with Adam Everett at short.
For Everett, those type of plays were the bad plays, the plays he failed to make. The good plays for Everett were mostly hard hit groundballs in the hole or behind second base, on which Everett, playing deep and firing rockets, was able to make an out. These, conversely, were the bad plays for Jeter--hard-hit or not-too-hard-hit groundballs fairly near the shortstop's home base which Jeter, playing shallow and often positioning himself near second, was unable to convert.
James goes on to talk about how that he's merely described a difference in style here, and from these observations alone, he can't tell anything about which is good or bad. Then he goes to quote some data that indicate Everett was very effective with his style, while Jeter was not even as effective as a normal SS.
Why am I going to all this trouble here? Well, it seems to me that Everett's arm is a key part of what has made him a special defensive shortstop. If he can't make really strong throws, he can't position himself as far back, and he won't get to as much in the hole or up the middle. However, as we saw above, even without a strong arm, Everett looks like an above average defender at shortstop. A weak arm will almost certainly keep him from being an elite defender, though, which he has been in the past.
I tend to think that even if Everett gets the job done as well as Punto, because of his style, he's simply not going to receive as much praise. He's the guy in the back of the class who doesn't talk to anyone but still gets good grades, whereas Punto's the guy who sits in the front row, volunteers to answer every question and gives the teacher an apple every day. Also, given the way that TV broadcasts focus so much on showing us the batter and pitcher between pitches, or close-up shots of whatever, it's going to be tough to notice a guy whose calling card is that he positions himself a little differently and doesn't do anything flashy.
In closing, I'd like to emphasize that this is much more a description of how things have been in the past rather than a prediction of how things will be in the future. As I noted, I have no idea what condition Everett's arm is compared to earlier this year, let alone compared to how it was last year or earlier in his career. Still, I would expect Everett-Punto-Harris(3B)-Span to be a lot better than Harris(SS)-Casilla-Lamb/Buscher-Cuddyer/Kubel/Monroe. So in the near term, the Twins will probably move towards playing more low-scoring games than they did early in the season.

Recent Letters to the Editor
In Response to Cup of Coffee: March 18, 2010,
brianS wrote: Yea, Marquette did me no favors.
davidwatts wrote: I was very disappointed that the Mankato CBS station went to the Marquette game instead of sticking to the UNI game and my bracket is done blown up!
meat wrote: Cc to Andrew: I'm suddenly going to be in Dublin for a short weekend this summer (late June), any suggestions would be good as to where to stay / eat drink / be Irish.
spookymilk wrote: Boy oh boy, would most of those references be lost on my...let's call them …
twayn wrote: Danke! Bummer that there's no radio for Friday's game with the Mets. Slowey vs. Johan.
Klawitter wrote: Working in Century City. Living for the moment in Westwood, at least until I sell my place in DC this spring and move everything.
New Britain Bo wrote: How's this for script idea: At a planning session for an … a committee of twelve Indians (4 dot, 4 feather, 4 West) hires a crack director to run their event. He shows up at…
DK wrote: I missed this earlier today since I was apparently too busy … in the Nightmare thread, but I'd be down with this too. In fact, I'd probably be willing to contribute to coverage.
Milt on Tilt wrote: I'm picking up my puppy tomorrow. I couldn't be more excited.
spookymilk wrote: Oh, and Rhu: one of my challenges in this week's Survivor game was to do a six-word evaluation of Lew Zealand. These were the … flinger never flounders for puns. Better than Belladonna with fish…
In Response to Nightmares at WGOMville,
hungry joe wrote: i wasn't planning on going out, but two heavies from my company were in town, and they took me out for a crazy night (got home at 2, and i've been hating life most of…
spookymilk wrote: I instantly love the person who took that photo, hungry man. I'm sitting here drinking Bass; yesterday I went the nostalgia route with my St. Pat's choice, opting for a drink that reminded me of college…
hungry joe wrote:
Milt on Tilt wrote: hehe. Beer.
spookymilk wrote: To be fair, drama is kind of the world I live in. I'm prone to exaggeration. Plus, I'm drunk because this script is making me tense and I needed to take the edge…
Milt on Tilt wrote: Yeah, man. I wouldn't "disregard" it either, because it was truly a horrifying move. Oh come now. That's just being completely over dramatic.
Milt on Tilt wrote: O-Cab lead the majors in Outs as a batter in 2009. Call me … Jimmy Rollins actually did. But Cabrera was second, and first in the AL. Even so. I could use that same…
nibbish wrote: I don't know what to make of it. On one hand, Cabrera was made of suck. On the other, any shortstop we put in there was going to. I'd have to side with DK and…
spookymilk wrote: Yeah, man. I wouldn't "disregard" it either, because it was truly a horrifying move. 0-Cab cleared the bases for the team's best hitter over and over. I know it's nice to remember…
DK wrote: O-Cab was a baseball band-aid over a severed limb. Acting like doing that was a "victory" is what seems foolish to me.
In Response to Luna - 23 Minutes In Brussels (Tell Me Do You Miss Me),
E-6 wrote: Love me some Luna.
In Response to Cup of Coffee: March 17, 2010,
brianS wrote: I dunno. But we're not really talking about a legal argument so much as an ethical one, I think.
Moss wrote: The old "you can't have your coke and snort it too" … can't get a conviction on a … test...and is possession of any amount of coke a felony??
hungry joe wrote: tell me about it...
brianS wrote: It is hard to consume if you do not possess.