The Broncos might be able to get by Patriots, if Manning doesn't play. Tom Brady is lights out in the playoffs, Manning not so much, more of a choke artist. Even in his prime he struggled to win playoff games, let alone against Brady.
If I'm not mistaken, I believe Brady owns Manning in the post season to the tune of 11-3. The other Manning seems to own Brady by I think 2-0, if I'm wrong I'm sure someone will correct it.