Maybe the fact is that playing the best teams you need to have a running game, which Peyton's team ignore since Peyton is the star.
Elway didn't win his Super Bowls, until Denver got a 1st rate running game.
Yes, you need a running game and a good defense to actually win the Super Bowl. Problem is, Peyton Manning commands an enormous salary. With that amount of money going to Manning, his teams don’t actually have the room under the cap to build a decent team around him.
It seems to be the case league wide. Brady won his Super Bowls before he got his truly big money. The Steelers won a couple of Super Bowls before Roethlisberger got paid. The Giants did not win Super Bowls after Eli Manning got the money. The Ravens haven’t won since the gave Flacco the big bucks. It may not be a hard and fast rule, but it sure seems that having a big money QB is not necessarily the best way to build a Super Bowl winner.
You absolutely cannot get to a Super Bowl by playing poorly in big games. In defense of Manning and Bradshaw....neither one played defense.