I think Sano has the ability to be very good, if not great defensively. Not much denying his natural ability. Time will tell if he wants to put in the necessary work to excel in the field. Corey Koskie and Justin Morneau are two examples of guys that came to the Twins pretty raw in the field and through hard work made themselves excellent defenders. I'd love for you to be right about Sano's 'demise at 3B'. I just don't see it if he keeps packing on the poundcake. I believe Sano will crush at the plate (home plate, that is) regardless if he's 250, 280, or 300 pounds. That's what he does, and the fact that his is a large human being undoubtedly plays into why he's such a powerful hitter. But I wouldn't worry one iota about his abilities or power diminishing if he was carrying the equivalent of a bag of salt pellets less than what he currently is. I won't even pretend to understand what 'layman medical hubris' means. But I find it quite disingenuous to believe his chances of staying on the field, and in the field, are unrelated to Sano's fitness level.