I think the bigger point being is that Belichick’s coaching style only works in a specific situation where he is able to criticize the QB and have everyone fall into line. He needs a specific balance of solid players w/ a specialized mindset that works within Belichicks system; whereas, other coaching staff trees are able to succeed more because they don’t follow such a rigid system.

You’re right that Brady only threw 1 TD pass in 2001, but you forget to mention that the team under Belichick went 5-15 before Brady took over and was ranked last in the league when Brady took over in 2001. Not saying he willed his team to go 14-3 the rest of the season, but he played better than a former PB QB in Bledsoe under Belichick’s coaching. Additionally, in the playoffs Brady played in a Blizzard against the Raiders, was hit below the knee and had to leave the game after spraining his ankle against the Steelers (a play that would be called roughing the passer in todays game), and then came back 1 week later (due to 9/11) with the sprained ankle and through no mistakes and clutch play was able to help his team win. That first SB run demonstrated Belichick’s genius as a defensive play caller, but Brady was able to improve upon the offensive system that was failing before he started.

Also, you bring up his DC super bowls, but fail to mention he had Lawrence Taylor (the greatest defensive player of all time). Now regardless, that 1986 playoff run was probably one of the most dominant defensive performances in the history of the NFL, but the point still stands. Belichick is an amazing defensive coach, probably the best of all time in my opinion because he can make players like J.C. Jackson, Kyle Van Noy, Jaime Collins, etc. look like PB players. But Offensively, he has rarely been able to lead a team with an above average offense without Brady except for 1994 and 2021 (2/10 seasons w/out brady). These 2 seasons are the only seasons where his offensive SRS was ranked above average. All 19 seasons with Brady they ranked above average in OSRS.

Regarding your Walsh theory: I agree that Walsh was helped immensely by Montana, but we don’t know what kind of coach he would have become without Montana. We do know that when he was the head Coach of Stanford he Brought them to Bowl wins 3/5 seasons. For Phil Jackson, you could say that is the case to an extent, but again we never saw him be a head coach without Jordan, Pippen, O’neal, or Kobe not on his teams. However, we can see that with Belichick. TBH we could say Belichick is very similar to Jackson regarding their GM capabilities.