Ok, there's lots of reasons that Belichek would be a bad hire:
-he's too old
-he wants control over everything which is what hurt him in NE at the end
- he routinely dates undergrad aged women
- his demands are just about taking over the program and setting his son up for the future
-etc.
But anyone saying that he "couldn't win without Brady" is not understanding what it takes for a team to be successful. Just look at Shanahan's record without Elway, Walsh without Montana, Payton without Brees, Reid without Mahomes, Noll without Bradshaw⦠The fact is that in the NFL most teams don't succeed long term without a franchise QB and most coaches don't last long enough to get two of them in a shortlived industry.
To win you need an OL, just look at Mahomes in the Super Bowl against Tampa when two of his OL were out and he looked pedestrian at best. You need a good offensive system, just look at Rodgers who looked washed pre-LaFleur and then won the next two MVPs. You need offensive weapons, look at Brady's last year in ME vs the next year in Tampa ( usually this is on the FO but that was Bellicheck's shortcomings as GM). You need a defense, look at the Bengals this year. You need special teams, Chargers for most of the Herbert era (at one point they had the best offense and defense in the league and still missed the playoffs). You need ownership that doesn't nickel and dime and lose players. And you need a competent FO who can provide all these things while also drafting well enough to restock talent.
A **LOT** more goes into it than "Brady won without Bill so it was all Brady and Bill's not good". I don't like the guy but Bellicheck is the greatest big game planner in the history of football, especially defensively. They shut down the Greatest Show on Turf, they dismantled MacVey's offense, they won 3 AFCCGs/Super Bowls with Brady throwing more INTs than TDs. Brady is a no-doubt all time player but the Bellicheck erasure is just absurd. The fact that he dragged a supremely undertalented team (which was his own fault as he was in charge of personnel) to the playoffs and division title with rookie McCorkle Jones of all people at QB is a triumph in, and of, itself