I'll say this again, and it's getting tiresome. All these rumours don't add up with what we heard in 16-17 from Anderson, Boucher, and Methot, who said EK was a great leader and teammate. Boucher, one of the most detail-oriented coaches around, praised his work ethic and professionalism. Last year was tough on everybody, especially for Erik with all the off-ice stuff. Only two players had good seasons and nobody was good defensively (not even Stone). But if Erik truly was an egomaniac who was selfish and didn't care about his teammates, it would have come out before this past summer. Nobody seemed to have anything bad to say during his three best seasons where he twice led the team to the playoffs and prevented them from getting a top 5 pick in 2016.
I don't doubt that the team is happier than they were last season - there's a lot of youth in the room, not many veterans, the style is a lot more fun, and there aren't any expectations (last season the team looked weighed down by them after the first big losing streak).
Dorion didn't trade Karlsson for any other reason than they couldn't afford him and he'd bring back the most assets. If he was bad in the room and needed to be removed for years, then surely Dorion would have traded him at the draft in '16 or after his second Norris in '15, when his value was highest? But Dorion said not 18 months ago that only one guy wasn't ever going to be traded and he wasn't talking about Mark Stone. So either PD had no clue about the secret monster hiding within his captain, or all of this is overblown and the locker room issues that were there had more going on than just Karlsson's presence on the team.