Here is my impression of how the Twins generally want to piece their teams together: you field a PTC pitching staff and defensively-skilled middle infielders to soak up the extra batted balls, since both of these groups historically are cheap, and since a high proportion of batted balls go through the middle infield. And then when you spend significant FA dollars, you spend them on sluggers in the corner positions where their defense is supposed to be less of a liability. One thing I know for sure, from hearing Jr and Gardy talk about their MIfers every year, is that "we want guys to make the routine play." I looked into this. There were 41 players who logged at least 1000 innings at SS since 2010. On average, those guys had 431.5 balls hit into their "zone" for every 1500 innings of work (ignoring balls out of the zone and any plays made on them). The average SS completed 350.3 plays on these in-zone balls in a season. The best SS was Brandon Crawford, with 402 in-zone plays made per 1500 Inn. And the worst was Elliot Johnson - although to be fair, the Rays use a lot of shifts and therefore move their guys around and out of their zones altogether, a lot. Just above EJ is Hanley, at 303 in-zone plays made per 1500 Inn. A spread of 99 plays over the course of a season. Compare this to say, LF, where the average defender had just 254 balls hit into his zone over the same period. But, at the bottom of the scale was JD Martinez, who was good for 178 plays per season, and at the top was Austin Kearns, good for 310 plays. The spread in defensive output, over the period 2010-2012, on "routine plays," was actually greater in LF than at SS, even though more total chances are available at SS. Carroll and Hardy are the only former or current Twins SS's who have played 1000 inn at SS the past 3 years. Both are above average in this regard, by 14 and 32 BIZ-plays per 1500/Inn, respectively. And in LF, Delmon is actually slighly above average, while Willingham is slightly below. In any case, there doesn't appear to be any greater benefit to having a good glove at SS, than there is at a "power" position like LF. Certainly not when it comes at the expense of hitting. Furthermore, what are the ramifications of a MIfer botching a routine play? Outfielder gets the ball and the hitter gets a single. What if a LFer botches a play? What about 1B or 3B? Guy gets to 2B, or if the ball gets through on the right side, it could be a triple. So if anything, if your resources are scarce, it might be more prudent to put above averge defenders at the corners, and your slow, poor defenders up the middle. Obviously the point with the Twins is that neither are their resources scarce, nor are they getting particularly fantastic defensive value out of their MI, just by having a contact-heavy pitching staff. At least, not in terms of measuring the "routine play." edit: The point being, that when a power guy like Kelly Johnson comes along for cheap, and he's not a particularly lousy defender either, you take him, regardless of his position.