This might be over-analyzing. When you consider their ages, the Twins starting hitting right now is good enough, excepting Buxton and Polanco. They are thin when it comes to speed and could use another power bat. The rest of the guys are good enough now and, excepting Mauer, Dozier, and Grossman, should get better. As you said, Polanco will get better and Buxton will probably be good enough someday. Defensively they seem to have figured things out. I have complete trust in the Twins position players, they look a lot like the early 00s bunch.