His team was a joke on offense before he got there. They added Wes Welker who is well past his prime and Peyton turns them into the highest scoring offense of all-time in just his 2nd season.
Before then he gets injured while with Indy. Indy was not only a perennial playoff team, but they were a perennial double-digit winning franchise. They were known for their great pass protection and ability to run the ball on top of Peyton's passing attack.
When he gets injured, the Colts go 2-14. They eventually draft Andrew Luck, considered to be the best prospect to come out of college since Peyton. And while Luck is very good, the offense is nowhere near as productive as it was under Manning. The running game is horrendous and Luck has to run for his life. Even as great as Tom Brady is, when he missed 2008 with injury, the Pats still went 11-5 with Matt Cassel.
Tony Dungy should worship the altar of Peyton every single day. Without Peyton, Dungy's legacy as a coach is completely different. He wouldn't even be considered a great defensive mind given the success the Tampa defense had w/o Dungy and the joke of a defense the Colts were while with Peyton. It was so bad that when Peyton was injured, Jim Irsay decided to clean house from the coaches, GM and the defense....knowing that his Indy teams were built on a stack of cards all along and that they had Peyton to thank for bailing them out.
And for all intents and purposes, Peyton is practically the team's O-Coordinator as well.
I'm not even a big Peyton fan. But, his skills and legacy as a QB, along with how he has changed the game and practically did it by himself far outweighs one horrible loss to a great defense and a Seattle team that scored points on plays that had nothing to do with Peyton.
YR