The Senators staff have absolutely failed Pinto.
It'd be one thing if he came back and got clocked into the boards again. Both times he came back he reaggravated the injury with basic movements.
All players always want to come back early. That's their job. It's the organizations job to stop them.
Based on what I've seen this looks like a partial labrum tear that has become a full and displaced one in need of surgical anchors.
Judging by the fact it got worse from the faceoff my, completely non-medical, opinion is that he has a posterial labrum tear. I have one too and when I tweak it I am am back to square one.
I'll likely never get the benefit of anchors as I'm not a professional athlete. I never think I'm going to reaggravate it until I have, so I understand why Pinto would think he was ready to play.
I had an anterior labral tear that I'd been dealing with for a long time before I got it surgically fixed. He definitely has a tear of some sort with the frequency and ease and unless he gets it surgically fixed now, it'll ruin his career before it started.
I had many situations very similar to Pinto. I'd dislocate my shoulder due to some trauma while playing hockey. Wait a few weeks, no more pain, range of motion is similar to before, things felt pretty good. One time, after returning too early, I re-dislocated my shoulder during the warm up by sweeping my stick to get a puck that was going towards the other teams end... Another time after returning too quickly, I actually dislocated my shoulder while putting my jersey on before the game... Basically, unless I took a few months to heal and re-strengthen the surrounding muscle area, it was very unstable even if there was no pain.
I finally managed to convince my Doc that it was affecting my quality of life since I would sneeze and the shoulder would pop out. I had 3 anchors put into my shoulder 4 years ago and although I haven't played hockey since (mostly due to pandemic), overall shoulder stability is so much better than before, I row nearly every other day with no pain or instability. I don't see how a young athlete doesn't do that at this point, the shoulder is currently in the injured state, he's likely out for the season anyway, he can get it surgically repaired now and heal thoroughly until the start of next season. He'll be able to skate shortly though so it's not all wasted time.
The team Docs should have known better and stopped the player from returning so early even if Pinto said he was ok. For what it's worth, I had Dr Aubry (currently on Sens staff) treating me after I had a concussion when I was playing minor hockey in Hull like 25yrs ago and lets just say I still have migraines to this day.
