I have been reading post-mortems on the Belichick era in NE, and I think that this one by Seth Wickersham might be the best. It's interesting that the relationship between Kraft and Belichick was never all that good, but as they kept winning the Krafts stayed out of the way. But whenever the team saw any adversity (like losing SBs), the Krafts would try to get more involved. Even during their last few SB years, it seems like Kraft and Belichick basically didn't speak. Now it seems that Jonathan Kraft is going to start having a much larger role in football operations. If I was a Pats fan, that's what would scare me the most. BTW, someone on the Pats board put it in a service to get around a paywall, but it was from ESPN.
https://archive.is/cljLt