Some very good posts in this thread. Well I guess it would all depend on your priorities: just make the playoffs, or go deep in the playoffs. Personally I would stick with the 5 man because tired arms down the stretch could be devasting as hell.
I wouldnt say the whole bullpen. Marte/Gordon/Sully probably arent gonna pitch tonight. Its more mop-up guys like Adkins and Ginter. Its hard to get used to the fact that Marte and Gordon arent our entire bullpen.