How Josh Donaldson Outperformed His Projections, Exactly
The narrative concerning Josh Donaldson has been established for the moment. He was a piece in the deal that sent Rich Harden from Oakland to Chicago in July of 2008. He was converted to third base from catcher gradually between 2009 and -12, taking up the former position in a full-time capacity at some point in 2012. Generally speaking, he demonstrated some promising offensive and defensive skills, but was never considered a top prospect. Then, in 2013, he produced an MVP-type season.
That Donaldson outperformed expectations is a fact. How he did so, though — like, in what skills precisely he demonstrated improvement and to what degree he demonstrated it — this sort of thing merits further consideration, I’ll suggest.
To begin that further consideration, we start with following — namely, a collection of projections for Donaldson entering the 2013 season. While the methodology for calculating each of them is different, the principles informing all four are roughly the same, including some combination of past performance, allowance for the player’s current place along the aging curve, defensive ability, etc.