I have an insane prediction to make. I think that Grossman's QB rating will be better than Manning's tomorrow. Here's why:
It's well-known that Manning is obsessive compulsive. He overanalyzes any big game, and puts his offense in an awkward position from the start. It's hard to stay in sync when the QB is 10 steps ahead. Then he starts to get pissed when the O can't keep up and starts to make ill-advised plays.
Forget about his (well known) playoff history, and just look at a couple of the Colts' playoff wins this year. He couldn't get ANYTHING together against the Ravens' D and the Colts had to rely on Vinatieri to do ALL of the scoring. Then against the Pats, he was a wreck for the first half. If Belichick hadn't let off the throttle in the second, deciding to rest on the lead, New England would have coasted into another Super Bowl.
I'll guarantee that Manning will go into the game tomorrow with too much info crammed into his head and the Indy offense will be a train-wreck until he settles. It's imperative that we throw off Peyton early, and keep the cleats to his throat throughout. If we can do that, we will win.
Also, look for a post-game blowout between Harrison and Manning. Peyton already chased off Mora (Playoffs?!?) and Vanderjagt (liquored up idiot kicker) when they spoke out against him. Look for Marvin to be on the free market within the next year.