It's amazing ... picture that the Broncos win that game instead of the Niners, and hold everything else constant. A win there would pretty much vault Elway over Montana in the ranks of historic QBs, since they'd both have 3 Super Bowl wins.
SB wins are a team accomplishment. I thought John Elway was the best QB to ever play, until Tom Brady emerged. I thin Montana was a great QB, but I just thin Brady, Elway and Marino are all better. This is from the modern passing era. You have to consider Otto Graham, Fran Tarkenton, Bart Starr, and many others, but their advantage was more being good passers against defenses designed to stop the run.