Tom Brady is not the goat.
He's the ultimate system quarterback. He played for an organization head and shoulders above the rest of the league, with the best coach in history. His divisional competition hasn't been relevant in over a decade, letting him waltz into the playoffs nearly every year.
When Manning goes down, his team goes 0-16. When Brady goes down, the pats go 11-5 with a QB that was hot garbage everywhere else. Easy to see how it's the system and organization and terrible division, not Brady.
Manning played for garbage organizations with mediocre coaching. Brady got lucky enough to be the guy slotted into a system, just like so many other former lacrosse players, 5'5" mini receivers, and other assorted average players made great by a system and coaches.
Rings is such a garbage metric for how good a player is in the ultimate team sport like football. Brady's defense won multiple Superbowls, but he's the goat because of that and vinatieri's clutch leg and the tuck rule? Please.
Add in the fact that he personally and his team are convicted cheaters. Props to the organization for taking every edge to win. But Brady is the beneficiary of that cheating culture, not the goat because he rode it to victory.
The metric for who is the best quarterback isn't the long term success of an organization in the ultimate team sport, it's who you would start a team with if you started one now. I'd put him in the tip ten maybe by that metric, but not even top five.
By that metric, and actual skills and play on the field, the list of guys you take before him is way too long. Rodgers, Peyton, Montana, young, Marino - all flat out better QBs than Brady, just not lucky enough to be playing for the most nefariously good organization in league history.