Assuming they do start Roark tomorrow... What Dusty should do is be very aggressive with his bullpen. Roark shaky early? Get him out. Pitchers spot comes up in a big spot in the 5th, bring in a pinch hitter. Big spot for the Cubs in the 4th or 5th? Bring in one of Madsen/Doolittle/Kintzler. Extend those three if necessary. Do what you have to because you've got two rested starters available for Game 5 plus Scherzer if needed. Of course it's Dusty so what the Cubs will get a couple off Roark, a big spot will come up in the 5th, Dusty will either stick with Roark or go to his normal middle relief and the Cubs will blow it open.