Until he's not on the 25-man roster, he may not be THE backup catcher, but he is A backup catcher. I thought the Doumit signing made a lot of sense at the time, but now I feel like it's not as great of a fit as I thought. The problem Gardy had before was keeping Mauer in the lineup at DH when Butera or Redmond caught. Since Doumit's the default DH, Gardy still has the same problem of using a catcher at DH but it's compounded by the wasted roster spot.