I don't think the shoulder injuries can be explained right now. It's more likely to be genetic than anything; whether it becomes recurring or not we don't know. The fact that he was driven head first into the boards, concussed and knocked unconscious, well it doesn't require being a Rhodes Scholar to put two and two together for "how" that came to be a situation, and I can promise it has little to do with his other injuries. You can justify it as lack of situational awareness, but that doesn't stop the best players on the planet from leaving an imprint of their face in the boards from time to time.
I'll put as similar as to the same way I did when debating things with Gniwder and then drop it there. We don't know what the future has in store for his shoulders. It's concerning that he has been injured on fairly mild contact, but we don't have anything to suggest that it's going to be a recurring problem the way that it was for Zetterberg and his chronic back problem. If it becomes that, we will know when we know, but not before then. As for the concussion, it wasn't as mild of contact. The hit drove him head first into the glass. You've entered a completely different realm of injuries once you bring the brain into the mix. I don't think the "how" or if it points to an IQ/self-preservation problem concerns me on the concussion like it appears to concern others. My concern is simply that it happened, because odds are he's going to deal with some complications in the short term and probably some complications long term as well.