Yeah, most people wouldn't keep training at a gym with a loose cannon on deck either. Sooner or later someone will get hurt, and they will make a big deal about it.
I know if I was a guest rolling in some other's guys school, I would just let the guy tap me and find a new partner. HH could also refuse to roll with him until he gets his act right.
As for starting trouble or drama... its a little bit late for that. I worry that this guy will be a real liability and community danger as his skillset develops.
My next question... is with his attitude, will he respect the tap? if he is neck cranking... I am dubious. This isnt just some guy spazzing out... this is predatory behavior.
better schools would have 86'd him by now... or dialed up the pressure so as to make him quit. e.g. limit him to brown and bb only.
JJ is supposed to teach humility through the 200,000 taps or more. But if ego isn't checked by repeated failures, then you just have a guy whose going to hurt someone.