He has three winning seasons without Brady all time. He is 1-2 in the playoffs without him. How many coaches would still have a job, let a lone be called one of the best all time with 3 winning seasons in 9 years? He is a sub .475 coach without Brady, thats worse than Matt Nagy, Bill O'Brien, Marvin Lewis, Dan Quinn, Jack Del Rio, and Rex Ryan. Tom Brady was the Patriot Way, and without him Bill Belichick would have been fired in New England as well, he was 11-16 in his first two years there in games Brady didnt start.
People can roll their eyes and disagree all they want, but if Tom Brady never happens in NE, Belichick probably ends up back with Parcells in Dallas in 2003.