Yep. The Sox don't have alot of strikeout guys on the staff either, so it's even more important to field a solid defense behind them.
I'm coming around on this move a bit. The key will be to make sure Mack is not ever in CF in the 8th or 9th with a lead, and to make sure that Mack is playing during his notorious "hot streaks" and not during his equally notorious slumps.