I don't think this a problem that the Twins will face during the season. Sano is not coming up until late June even if he is killing it. That's the reality of baseball economics. At that point all of Mauer, Vargas, Hunter and Arcia need to be healthy and performing (in addition to Plouffe and Sano). those odds seem like 1,000,000 to 1. If all 6 are doing great then it's a good problem to have. In addition to that it assumes that Sano is playing defense at an MLB quality level. People seem to be hoping for the best when I would be surprised if he isn't the equivalent to Arcia at 3B (or worse).