Much of this is based on Walt's statement that Votto could move positions to make way for another player in a manner similar to what Pujols did in St. Louis.
I disagree about Votto's defense. 1B is about digging throws and completing the other end of the tough plays that would otherwise be an error on the guy who made the throw or an IF hit. I don't see Votto as very good at that. He's rangey over there, but that is secondary where 1B is concerned IMO.