If Marion is out, I wouldn't be so quick to dismiss the contribution of Tashard Choice. Running the ball will be tough sledding no matter who we put out there. Not saying I would abandon the ground game, but it won't be a day at the office vs. Green Bay either.
Should Choice be the number one come Sunday, my primary concern would be pass protection and blitz pickup. Barber is excellent in this area. That is not to say the kid would be totally incapable, but some breakdowns would be expected. It happens, he's a rookie with limited snaps under his belt.
Also, while I believe spreading the Steeler defense would be the way to go in certain situations, 50 offensive snaps out of the gun, in five-wide would be really bad for us. It would be bad in ideal playing conditions, forget frigid temperatures and poor surface conditions.
According to the forecast, the win should not exceed 20 mph, so that's a plus.
Point being, I would not ever give an elite-level pass rush the opportunity to pin its ears back with deep drops all day. I want Tony Romo to be around the rest of December, and God willing, January.