I've played sports with a lot of jerks in my life and I've seen guys change with a different set of teammates. They are still vocal but they fall in line more than their previous situation. We ran lots of hockey tournaments back in my 20's and recruited guys like that over and over again. I'd say we were able convert them into better humans and they made our team better (more often than not). Creating the right culture is key. Who on the Rangers could be someone he respects and get him to calm down? I don't see it. I think the culture allowed this aggressive individual to get out of hand.
I don't see the risks of signing him to an AAV close to $1M. Our team core is tight and it won't derail it to a point where our management keeps him in. If he tries the same stuff, he's gone and it's done with and in the past.
I'd take a low risk chance on him for sure... with a short leash
It's not about being a jerk with DeAngelo though. He's a terrible person in general.
That said, as for trying to "change him", why bother? Our guys need to focus on playing hockey and trying to win rather than having to babysit a grown-ass man.
Ultimately, he won't accept any "show me" contract unless it's October and he's still unsigned. Plus, doubtful he'll be happy playing in a "foreign" city.