No, I think the Sox know they need a front line starter to go deep in the playoffs as well as to better their chances of making the playoffs. However, if Munoz does good, you may see him moved to the bullpen following the trade and then him and Cotts would fight for the 5th spot next year.
Plus, it seems like Cotts may be the guy on the way out when they make the trade, most teams seem to be interested in him.