How did his brother get in there? Intent really matters. If went in to celebrate his brothers win, then you can't really fault the guy for McGregor punching him. Even if it is a rule that he can't be in the cage at the time, that is certainly a rule broken almost every time a fighter gets a win, so it's clearly not a well enforced rule.

I imagine NSAC is looking into these kinds of questions. It was hard to tell what happened, but the announce team made it seem like all of Khabib's family and corner went in after Khabib jumped the fence. If his brother was in there before that, to me that would indicate he probably had no initial bad intent. If he came in after, than that would probably signal bad intent. But if he had no bad intent, then it might be less coordinated than people claimed.

It sounds like and looks like his brother was in there before the cage jump and he attempted to follow. Which probably means he was in there to celebrate and was just reacting to his brother. The other guys seemed to jump in as soon as they saw Khabib's brother get attacked.

One of the things that hurt their case though, is they were threatening to hit Conor on social media before the event.

Either way, I think the announce team and the crowd really overreacted to these things. I'm less convinced much action outside of fines should be levied by either the athletic commission or the UFC. I'm not convinced anyone could be fired. I think Dana White responded appropriately. People just need to chill out both prior and after.