Kassian is coming along nicely. He is doing exactly what the coach is asking him to do, figure out the D side of his game first and not run around looking for hits which would take him out of position. If he was screwing up like half the guys in this thread are suggesting, he'd be on the 4th line with minimal minutes. Torts doesn't feline-foot around with accountability.
Maturity takes a different course of time for different people - Kassian is taking a bit longer than others. When he gets it all together, he will be a force.
Re Hodgson, why is it never suggested he was a problem in the dressing room? That was a huge part of getting him out of here. The timing may not have been good, but to use a business analogy when a owner or mgr has a problem employee, no matter how talented they may be, if they are affecting the rest of the team get rid of the problem asap.