It's always going to be debated. Right now, it's Tom Brady because of the rings, so some people say. When he's done and out, they'll bring up the close games, the kickers, the clutch defensive plays, spygate, deflate gate and how the Falcons completely choked the game away for #5 and he completed prayer passes that 6 times out of 10 were interceptions and incompletions the other 4 times except for that one play. There will be a lot of arguments to try and knock Tom Brady down, heck, there are already and have been for years. But he's fresh off a Super Bowl and is the hot topic right now.
I love Tom Brady, have defended is play thru everything and the Patriots, but i'm not blind to the debates against him and though right now everyone says the rings seal it, in 5 years after he's done, they'll bring up everything else and all these other names will come into the mix.
IMO, once you're in the conversation, there isn't much more you can do because none are perfect and there will always be arguments against and for another. How many times do we hear the Rodgers isn't clutch argument. It's not mine, but certainly lots of other people use it. Brady gets the clutch nod all the time. He's just clutch, ask anybody, and IMO that last game everyone remembers, the only thing clutch on his part was lady luck and his defense. Oh, and the Falcons choking in a Donaldesque way, yuuuuge!
The narratives change so fast while guys are playing. If Brady comes out and has a pedestrian season, which I think he is poised to do. A lot of those passes towards the end of last year did not look like Brady to me. But maybe i'm wrong. Anyway if he's pedestrian and Rodgers picks up where he left off, everyone will be back on the Michael Jordan of football analogies again.
But when the careers are over and all is said and done Rodgers is most definitely going to be in the conversation for the best at his position. Just like Gayle Sayers is always there and he had but a few short years, and Bo Jackson is always in it with the caveat, "if he never got injured" arguments for and against. The best all have them, Rodgers will be no different.