Somewhat of a tangent - Mauer not hitting as a first baseman, or Mauer being the worst hitting first baseman is not the thing to focus on. Teams can construct their lineups differently defensively. Dozier's homers and XBH in general are welcome regardless of where he's playing on defense. If the Twins had another player that had no other place in the field and was outhitting Joe right now, then sure, bench Mauer for this other guy that provides more value. I don't see that guy on the current roster. If you wanted to pretend that Joe was at second and Dozier was at first, would it be better somehow? If a team has a cleanup guy an he's a catcher, or a SS, or a 2B... that's great. I don't subscribe to the idea that certain defensive positions have a duty provide a specific brand of offense. What is significant is comparing Mauer to other hitters batting 3rd in the lineup. That feels like fair ground for criticism. In that sense, there's a big problem. Most of the team is slumping right now, so it's not just Mauer, but it couldn't hurt to try some other configurations, they can't hit much worse as a group as they are now.