I concede.
1. Brady
2. Montana
3. Who cares?
I think you can argue for others at the 2 slot. Montana had the benefit of a great new offensive system ahead of its time, he had better talent around him (c'mon, Rice? the GOAT WR?), and while his SB stats are awesome, he played when the NFC champ regularly stomped the AFC champ. His NFC title game stats weren't nearly as good (and those are a better analogy to what Brady faced in the SB).
Ask yourself this, how would Montana's peers do if they were in that system for the same time period? Elway, Marino, Fouts, Kelly, etc.? I think they would have won 3 SBs too.
Montana may be 2, he's definitely top 5, but I don't think there's a lot of daylight between Montana and somebody like a Unitas, an Elway, or a Favre.
Alex.