I know many will disagree but John Elway should have a more persuassive argument.. The guy made 3 SB (lost badly) but got there without great offenses. The best offensive players he had in that era were Vance Johnson and Rickey Nattiel who were nothing to bark at ... also he had no running game, which was the majority of the offense in the 80's- 90's...
Once he had the weapons at the end of his career he took 2 straight titles that could of easily been 3 despite a fluke loss to Jacksonville a year before and retirement the year after..
top 5
1. Elway
2. Brady
3. Montana
4. Manning
5. Marino