But you also can't eliminate what he did without Brady either. Yes, he was an amazing DC with the Giants. But he also flamed out with the Browns as HC and quit on the Jets via a paper napkin.
Brady still won without Bill. The same can't be said the other way around. It is what it is.
I think it's more likely they worked very well together for a number of years and shared the same mindset in terms of sacrificing for the team, work ethic, etc. There's nothing wrong with that. But you have to acknowledge Brady's contributions just as much as Bill's.
Belichick won two Super Bowls with the Giants - without Brady. In fact, in 1991 the Giants beat the favored Bills with a second string QB - Jeff Hostetler - because of Belichick's magnificent defensive game plan - one that was actually enshrined in the Hall of Fame.
In Cleveland BB took a horrible team and got them to 9-5 - and made them a Super Bowl contender - until disaster followed when the owner, Art Model, announced in the early season that the Browns were leaving Cleveland.
Brady won one time with the Bucs and lost twice.
Regarding the Jets both Parcells and Belichick "quit"
BB was cornered into the job - by contract - by Parcells - who was attempting to prevent him from taking a job with NE. BB knew that a new owner - Woody Johnson - was taking control of the team and did not want to be saddled with someone he did not know and someone who did not hire him. Looking back, he clearly made the right call as Johnson has revealed himself to be an inept owner - perhaps the worst in the League.
Doug Marrone did the same thing in Buffalo - he did not want to work for an owner who did not hire him. Actually, Parcells felt the same way - he left NE because he could not work for the new owner who did not hire him.
Brady was a great, great player. And Bill Belichick drafted him and developed him - when nobody else saw what he could become.
I give the players all their due - they play and win the games.
But BB is unique. He is a prodigy who was raised to coach football by a brilliant football mind - Steve Belichick - and has been uniquely successful over the years.
Maybe he'll flame out at NC. But, I doubt it.
Anyway, interesting discussion.