I think there's a distinction here that can be made between building a roster around platooning and simply planning it during roster construction. My hope is that the Twins would use it in the planning stages as they fill out their bench. For example, realizing that every infield hitter they have is better against LHP and then go and find a infielder in the offseason who can fill in as a LHB that might play everyday and be rotated around. To me, it doesn't make a lot of sense to start the season as they did this year with the left 3/4 of your starting infield as Plouffe, Florimon, and Dozier, who are all better against LHP, and then have two players on the bench who are also better against LHP in Carroll and Escobar. It also doesn't make sense to start the season with three other positions where players have similar platoon strengths: RF (Doumit and Parmelee), 1B (Morneau, Parmelee), and C (Mauer, Doumit) Our initial plan for CF was the same as well, with Hicks, Mastro, and option 3 Ramirez as all better against LHP. Clete Thomas might have been a better option to start the season. Willingham in LF, btw, has an .823 OPS vs. RHP and a .855 OPS against LHP for his career, so he's an example of one of maybe two players (Mauer was about equal this season, but for his career he is about 100 points lower vs. LHP) that you have on the roster that you could probably assume a platoon type situation isn't going to improve production. So, with the exception of Hammer and Mauer (Morneau is roughly a .700 career OPS hitter vs. LHB, so I'd say you could platoon him) a platoon or at least a backup who hit opposite would have improved production at 7 spots in the lineup. You can't plan your roster around it but you can certainly try to take advantage of it when constructing a bench, at the very least.