Sox fans have been told not to get too excited about WM b/c he doesn't walk enough and he strikes out too much.   It would be better if he didn't but if his raw power produces elite slugging, he will be a very valuable player.

If Will is a worry then what about Montero who is only 1 year younger:

                    BB%    K%
WM '12           5        24
JM '12             5        22

Spin from Seattle?