Lol, You don't have to see the rain actually falling from the sky to know that it rained.
You laid out the facts as you want to view them....& ok..that's your opinion. But you're still dismissing all the circumstantial evidence that doesn't support your stance. Jimmy Johnson was a successful HC prior to Marino. The fact that he didn't enjoy the same success he did with Aikman in Dallas isn't an indictment on him as a HC..nor Marino as a qb, it just didn't work. Ditto for guys like Pete Carroll who was barely .500 between 2 different stints as a HC & was trash his 1st 3 years in SEA before finally getting it together. In the case you're trying to make it isn't even that clear b/c Brady coming into the league had 0 track record of anything. There's a high probability that those 1st few championships go to Bledsoe............ if he doesn't get hurt early in that season. Just b/c Belichick didn't have a very good record in the NFL as a HC to that point and Brady's record was unblemished b/c he'd done nothing doesn't exactly mean Brady himself was the catalyst for Belichick's success. Correlation doesn't equal causation.
& most guys don't have the privledge of playing under the same HC their whole career...even alot of greats. But, there are a few guys who more than likely owe a substantial amount of credit for how good & successful they were in their careers to the guy roaming the sidelines...& rightfully so. Bart Starr & probably Terry Bradshaw just to name a few. But for some strange reason, its blasphemy to do that with Brady.......even though he was largely a game manager for about the 1st 5-6 years of the Pats dynasty & if you look at his numbers during that time & you remember how those teams won, Belichick's signature is all over them...But you know that..you're just being obtuse.
Dude was/is a great COACH who was instrumental in numerous SB championships and deep playoff runs for multiple teams prior to Brady even entering the league. His lack of success with the Browns & the fact that he is still the last HC to win a playoff game for them after 20 years only gives more creedence to how good he likely was.......& it also speaks to how much of a trainwreck that organization really was while he was there...& continues to be since he's been gone.