Agree with all of that. And I think Scrivens, Ference, etc... all saw in Hall a guy who wasn't really a team leader, but an individual. That's not a criticism of character though. Hall was brought up to be a singular offensive threat... to be the spear... to drive the play. It always takes guys like that some time to learn the subtlety's of when to make the safe play... and what actually is the safe play. Who the heck wants to dump the puck, or chip it out, in when you are used to carrying it on your stick?
The problem came when he was ALSO thrust into a leadership role. Then ADD on top of that the fact that Hall HATED to lose. An admirable trait, but not so admirable by veteran, defensive minded teammates who DO GET IT when it comes to how those little plays, those bad decisions add up and lead to losses. Hall also had a BAD HABIT of swearing when we were scored upon... unless he knew it was his fault... in which case he'd get quiet and embarrassed. I"m sure he didn't mean anything by either of those actions except... I want to win... but teammates may have interpreted it differently. You can see how they might have thought: he gets mad and vocal when its my fault, but keeps quiet and takes no responsibility when it is his...
These are the little lessons players need to be able to learn outside of the spotlight... especially alpha, hothead types like Hall and Subban... when you are young you sometime aren't aware of how others interpret your actions. You have all the best intentions but your actions can be misconstrued.