For years (long before sabrmetrics) I always believed that you could lump fielders into three categories: 1) elite difference makers which comprise maybe 15%. 2) guys that are difference makers because that are that bad with the glove (again about 15%). And 3) everybody else who are so similar that over the course of a season they will have roughly the same impact with the glove. Interesting that the Twins had nobody in the elite category and maybe two in the bad category (Hunter and Susuki and they were close to the middle group)