There is enough versatility there that his value is well beyond SS. If Drew gets hurt, XB sticks at SS, Middlebrooks at 3B. If Pedroia gets hurt, Drew or X moves over to 2B. If Middlebrooks gets hurt, XB to 3B, Drew at SS. If Napoli gets hurt, move WMB to 1B, XB to 3B. Some guys will have to play slightly out of position, but there will be plenty of options.