If JR turns around and is facing Crowder before hitting him, then I think his suspension would have been much more severe.
I'd agree with that. That is just plain fighting. In that case the penalties are around 7-15 games for first offenders. The Rudy Tom... ,I can't spell that name, hit, I think the guy's name who did that was Kermit Washington but I could be misremembering the name, got a 15 game suspension if memory serves. It might have been longer.
I would argue JR's hit was as bad or worse though. It was intentional, lets get that out of the way. It was a closed fist, he knew Crowder was behind him and there was absolutely no reason to be swinging a closed fist behind him like that. If you want to argue it was unintentional then I don't know what to say.
At least in a fight situation you have an opportunity to defend yourself. You at least tell the other player by your actions a punch might be coming. Just throwing a fist out of nowhere leaves you no chance to defend yourself.
2 games for a repeat offender is a joke.