You're probably right about a shoulder dislocation
I popped my right shoulder out of place over 30 years ago and had to be driven to the emergency to get it popped back in
It was out of place for almost two hours before a doctor finally came to pop it back in, and was super painful until it got popped back in place. I was in a sling for a couple weeks before I could even use it again, and any full contact sports activity was out of the question for a couple of months because of the length of time it was out.
The doctor told me the longer it was out of place, the longer it will take to heal, so it's hard to say how long Brazeau will be out of action
Was it all the way out, or a partial dislocation? I lost count of how many times I wrecked my left shoulder, but from what I remember it was 100x worse going out and coming back in than when it just sat there dislocated. Now, on the partials, total misery. There was no healing for me. The bones in the shoulder are all chipped away and everything around it was torn. I'm held together now with screws and a bone graft.
I remember too, watching my father in a hospital bed with a dislocated shoulder. He was in pain, but ok enough. As soon as anybody touched his arm he writhed in pain. They ended up knocking him out to put it back in.
Shoulders are wildly complex. Hopefully Brazeau gets patched up quick and is able to put this injury behind him. Same for Poitras. The mental game with your own body after this sort of thing is really rough too.