well... I think that it is a chicken and egg situation. The previous 2 seasons Twins' pitchers had the worst ERA and the highest opponent OPS with Butera rather than any other catcher. This season has been reversed. I suspect Liriano has a lot to do with that trend Here are the numbers (for the total Twins' pitching staff) : 2010: Butera: ERA 4.13, OOPS .747, Mauer: ERA 3.81, OOPS .723, Ramos: ERA 3.29, OOPS .707, 2011: Butera: ERA 4.92, OOPS .794, Mauer: ERA 4.43, OOPS .775, Rivera: ERA 3.91, OOPS .716, 2012: Butera: ERA 3.84, OOPS .655, Mauer: ERA 5.46, OOPS .851, Doumit: ERA 5.06, OOPS .801, So basically using your argument, based on 2011, Rivera and not Butera should have been the Twins' backup catcher.