Look folks this is simple. Bill is a good Defensive coach. He took a head coaching job in 2000, and the team was bad. Then the QB got hurt and this unknown nobody QB who made all the scouts look bad came in, and then the team became this winning team for 19 years. With all that winning in an attenpt to diminish Brady because the scouts all got it wrong.
Bill took on this genius identity, and it became "Bill can take any Qb and win 6 superbowls"; well at some point, whatever happened.... Two egos clashing, Bill believing his headlines, etc, - but Brady left, went to another team and won a superbowl, and Bill was going to make whatever half ass QB into a hall of famer and keep winning...
That didnt happen; the team got worse, the QB got worse, the team hit new lows. Excuses were made, but but but..... And then Bill got fired and nobody would hire him, and I am amazed that Brady was able to do what he did covering up bad decisions and lack of focus on offense for 19 years.
Now its over, and it's an entire new staff and will probably be a completely different team - that will be, whatever. End of story.