Bill Belichick has coached 9 seasons without Tom Brady as his QB. 1991-1995, 2000, 2008 (brady was injured in week 1), 2020-2021.
He coached with Brady as his starting QB for 18 seasons.
His playoff record without Tom Brady as his QB is 1-2. 9 seasons. 1 win.
Brady has played 1+ season(s) without Belichick as his head coach. His playoff record is 5-0.
If Tampa defeats Arizona or LA next week and Brady is healthy, he would be starting in his 15th conference championship game.
I know Belichick can coach and can still coach. But, I have come to believe now that at the professional level, it's definitely the players. Everyone gushed over Gregg Popovich for years and the man hasn't won jack since Tim Duncan retired.