At this point I just assume it’s Sid. He likes playing in the same system, where he’s comfortable, and gets to attack offensively. He really may have told the org that he doesn’t want to play under anyone else.
The only other factor is that FSG just loves their Boston Sully, lol.
I think both elements are at play.
FSG definitely (and Dubas as well) think the sun rises and sets out of his ass. Supposedly he negotiated and signed his extension directly with the ownership, no GM involvement (was Hextall at the time) and the noises from the organization have all been shining him on about how great he is, even as the team continues to implode.
I’m speculating here, but I have to guess the players, specifically Sid, have a hand in it too. For exactly the reasons you suggest. I don’t think an unhappy leadership group, that FSG has committed to a retirement tour for, would fail to move the needle. If they wanted him gone, you wouldn’t be seeing absolutely no smoke around Sullivan’s job. There would be rumblings IMO. And I don’t think we’d be hearing noises about ownership “promising
So, yeah, the whole org has basically determined that he isn’t the problem, and escapes blame. And it’s very possible that the only senior players who could pull rank on him are basically at the point of saying “nah”. Which is a damning indictment of both the org’s lack of ambition, and the players. They’ve earned the right to call their shots, and certainly to end things how they want. But playing out the the next few years as league doormats is going to be hard to watch. It was inevitable that the team would be bad. It wasn’t inevitable that it would happen so soon or so suddenly and without pulling every lever to reverse course. Sad ending, especially when your team is proving that a young coach with new ideas (and 15 odd million in dead cap) can get even a kickstart a team full of veterans.