1. Mauer is one of the better defensive catchers in the league and is certainly no worse than average. We can all agree on that. 2. Doumit is widely regarded to be the worst defensive catcher in the league by pretty much everybody. 3. Catcher is the most important defensive position on the field. You're looking at this backwards. Mauer's offense isn't part of this discussion. Joe's bat is in the lineup no matter who plays where. What will net a higher result? Mauer defense at C + Parmelee offense at 1B - Doumit offense at DH/RF or Doumit defense at C + Doumit offense at C - Parmelee offense at 1B/RF While I don't trust the metric much, Doumit's dWAR has been in the negative 6 of the 9 years he has been in MLB. Couple that with the eyeball test, other metrics that say he's awful behind the dish, and general scout/analyst agreement that he's awful and it's not hard to determine that he'd do some real damage behind the plate 130 games a year. Also, Doumit is due for a continued regression as he enters his mid-30s while Parmelee has a decent chance to trend upward. But wait, there's more: Ryan Doumit's 2013 OPS+ is 97. Chris Parmelee's 2013 OPS+ is 93. Ryan Doumit's 2013 WAR: FanGraphs 0.1, BB-Ref 0.2. Chris Parmelee's 2013 WAR: FanGraphs 0.0, BB-Ref 0.9. Methinks you're not looking at this very objectively. I love the fact that Ryan Doumit is on this team as a backup C/DH/RF. But if you're going to bet on the future, you give Parmelee ABs to see if he can hit MLB pitching. And, again, you never answered my question: What do the Twins have to lose by playing Parmelee in 2013? You can argue that there is little upside in playing Chris but there is upside, small though it may be. On the other hand, there is no real downside to letting him play through struggles in a 74 win season. At the very least, you leave the season knowing whether he's a viable option to start in 2014.