I am very high on Polanco's eventual success in the majors, but it's not clear to me his bat is ready right now. It's fun to joke around about his stellar major league numbers, but included in the joke needs to be the .385 BABIP that they're probably built upon. I'm more persuaded, by his AA numbers, that a year in AAA will do him a world of good, rather than force-feed him in the majors. And of course, he's going to have to sort out for himself whether he has the makings of a shortstop's arm - my sense from watching him is he's sacrificing some zip in favor of directional accuracy, but too many bounced throws means it's not working, and if he can't cut loose on his throws and have them go where he intends then it's second base for him. This area of development is also something that seems better suited for AAA time than on the 25-man MLB roster.