Like Chief and Vanimal, I don't really follow this. I just now found out about this move so I haven't read any details about Santana's prognosis. If he's going to be out for only the bare 15-day minimum they can probably get by with Nunez as their only backup infielder for now, especially if you figure Sano can play third if a second backup is needed. (At least I think I remember that he has played there, hasn't he?) But if it's longer than that I don't think an outfielder should have been called up, especially since we have Arcia on the roster. That said, of course I hope Kepler does well, but I don't expect anything noteworthy. IMHO almost everyone on this site has highly inflated expectations about him.