Our own devil_fingers spent an inordinate amount of time creating his own methodology to evaluate catcher's defense based on throwing out runners, preventing wild pitches and passed balls, throwing errors, and catching errors. Not surprisingly, the three Royals backstops fared poorly: Pena was -2.9 runs in limited playing time, Buck was -4.8 runs in more playing time, and Olivo was 113th out of 114 at -8.8 runs (thanks Mike Napoli).