That's exactly how I see it too. I think Sweeney went to Swayman and they talked last year and Jeremy said he loved it in Boston, wanted to be a lifer and wanted to be #1. Sweeney went with that commitment and moved Ullmark. Then Swayman either turned on him or listened to his greedy agent and they started digging in and leveraging the situation assuming Sweeney would have no choice. Sweeney took this as a betrayal (magnified by the public comments Swayman made) and he, along with the people above him felt betrayed and as history shows when that happens they dig in and are even angry and vindictive. I wouldn't be surprised if they then offered less and less term taking an earlier offer off the table.
Bruins culture is a team of unity, but they never let anybody stand above all that. It's just not how they operate. If Swayman doesn't come around I wouldn't be surprised if he's traded before December, and probably to a bottom feeder like Anaheim.
It's not what I want to have happen, but at this point the only way out may be for Swayman to fire his agent, put the blame on him and start over. That might get management to yield a little.
I could be wrong. It's just speculation.