I think that Sauron knows exactly what is going to work in HIS system, and when someone else tries to take it and apply it to their own slightly different system it doesnt work as well, or if they try the same exact system they're not as good at identifying the right players. Kind of like how not many people could do a good job copying Chip Kelly's system exactly, only this one actually works.
I also imagine that a lot of information is stuff that he has in his head and doesn't share all of it with all his assistants. And also it works better because he enhances it with cheating.
I do have infinitely more respect, albeit grudgingly, for Belichick than I do for Brady, who if not for the biggest helping of right-place-right-time, crap-assed luck in the history of football, would probably just be some dickhead who backed up Matt Hasselbeck for a few seasons or something and then retired 10 years ago.