Elliotte Friedman recommended this article and he was right, it's a very interesting read
http://www.csnne.com/boston-bruins/boston-bruins-aim-in-new-season-reunite-a-divided-team
Brad Marchand quoted in the interview saying that the Bruins had a divided locker room last year and it caused major issues. Also, players, including Lucic, mentioning losing Boychuk really damaged the team, how they struggled after he left and how he was a huge leader in the locker room and they couldn't fill the void.
From Marchand:
The article mentions the divide seemed to be between the older player and younger ones. Vets wanting the kids to step up more and the kids feeling excluded. Losing someone like Boychuk, who (from what is said) was the unifer in the past, the active voice that kept the room intact, was a bigger impact than expected. (although it shouldn't have been, outsiders even knew how valuable he was )
I had read that Hamilton wanted out, and thus he was traded.
Hamilton and Reilly smith were two of the younger players the article mentions that gave up , didn't care and thus are gone. The flip side is Beleskey turning down more $$ to sign with the B's because he wanted in.
I was surprised that Marchand would be so open about the locker room usually that is a subject (differences/ problems/ issues) that players don't go public with.
Anyway, it will be curious to see how the changes work. I've watched them for years and last year they were 360 from the Bruins teams of the past, something was wrong. Hopefully, they get back on track, I imagine being on a team in a divided room is difficult.