Let me ask you this, not as argument, but just throwing out ideas: What IS Belichick's legacy? Is it really a suite of players that can continue to win, or is it the system? Doesn't it sort of go against the Belichick philosophy to just hand over a bunch of players to Josh or Matt and say "run with it"?
I think the crux of the Belichick philosophy is this: Be smarter and tougher than the guy across from you, and DO YOUR JOB. I feel like if you gave Belichick 50 random players and two weeks, he would crush any coach in the history of the game in a best of three (to take out the "Any given Sunday" factor). Part of the coach's job is to assemble the players they have into a workable unit (well, three of them). Sure, you stockpile those guys that work for you (Brady, Brown, Edelman, Adam Gostkowski, Wilfork) but you don't marry yourself to them.