That boarding wasn't even a malicious hit. Gudbranson just didn't brace him at all for the hit and Cousins caught him and the damage was done when both of them lost their balance and crashed into the boards. I mean sure, 5 wouldn't have been a crime but i can see why it's only a minor. Gudbranson likes to hit himself, he needs to brace himself better to take one too. Is that the sort of hit to lose your mind about? I watched it a few times and while it's sort of reckless, it's not like it's a hit that had clear intent to injure, just a bad outcome.
But it's still a really bad look at whoever the bald guy is coaching the Blue Jackets, Gudbranson and the entire league. I mean, Gudbranson didn't just lose his mind, he lost his mind twice. First time right after the hit and he was furious the entire time after that. It's a terrible look for the coach that he can't control his own players in a 1-goal game when it was obvious that the player couldn't control himself, and that's a brutal look for the league because that could have ended really badly, and he is going to get the book thrown at him.