To be honest, if I was Tomlin, I wouldn't want Pouncey to play. Lets assume that this game turns out to be as close as last years, same exact field position the Steelers had with 8 seconds on the clock before that game winning TD pass from Ben. Now imagine that happens again, Ben snaps the ball, Pouncey's ankle decides to buckle and Raji sacks Ben and the Packers win. Now it probably won't come down to Pouncey's ankle being the deciding factor of the play that decides the outcome of the game, but with having him on the field creates a liability for the Steelers offense. Honestly allowing us to get pressure, and allowing Ben to get a good clock going in his head would probably be better than having Pouncey go out in the 4th and Ben getting all this pressure in his face that he hasn't been used to all game.