I think Aaron can make the transition, in terms of range, but it's a stretch to say that a guy can play second because he's athletic. The pivot is artwork, and it's tough to start learning it over night. And, for a guy who already had reconstructive knee surgery once, I'm a little concerned about putting him there next to a shortstop who's range and quickness aren't what they used to be. In my mind, that may translate into a lot more bang-bang pivots, a danger for any experienced second sacker, and downright scary for one who hasn't spent years getting out of the way of baserunners.
On the other hand, maybe playing second base will change his mindset at the plate. I always thought he had the potential to hit more like a modern second baseman than a third baseman.
Next Reds manager, second shooter. --Confirmed on Redszone.