I don't think Mauer is as good defensively as he was early in his career. I think he lets too many balls past him (scored Wild Pitches) and his throwing was off last year. That said, I think he's still a good defender and within reach of winning another Gold Glove. Most of Mauer's throwing woes were from the pitchers not giving him a chance or very little chance. Regarding Doumit, I'm not in love with him DHing and I also don't think he's an ideal backup. The ideal backup for Mauer could/should be a defense-first RH hitting guy with some power and versatility. There aren't a lot of those guys out there, obviously. I don't think the season turns on Doumit's defense. Pitching is the key here and secondly, the guys given an opportunity to become regulars need to earn it--Hicks, Dozier, Plouffe, Parmelee, Arcia and Florimon.