Wasn't his cousin in the Baltimore Ravens D? Jones can definitely move up to HW division and there are few in the HW that can most likely put Jones in his place.
As far as LHW goes... I could try to deny it all I want but Jones is the most elite as he proved... Although I think Mousasi might be able to put up a great fight against Jones. Only problem is Mousasi is not in UFC.
I would have to disagree about the reach being his primary factor for winning. I mean obviously it puts him in an advantage but most of the times, every opponent seemed to feel "awkward" when standing up against Jones. He's got a very unorthodox style that gives him the title of a crafty fighter. It keeps you guessing on what you should do... and when you are thinking about things like that in the middle of a fight, that's trouble for you.