Winning a ring is a team accomplishment, but for a team to win it all there are times when the QB has to carry the team. That's what the greats do, but you have to factor in how much of the weight they have to carry. Say you were holding a race among the greatest runners, but the runners had to carry various size barbells while running. You could just say whoever had the fastest time was clearly the best, but if you wanted a fair comparison you would factor in how much weight they had to carry. Of the great QBs on everyone's list, Marino had, by far, the weakest supporting cast. He had to carry the greatest weight. That has to be a factor when determining individual greatness. Ring or no ring he is among the best.