Interesting that he really is that short. Lots of bosses were short: caro gambino, casso. Tony ducks, salerno, scarfo , and alot of others. Amazing how a guy 5 ft -06 can have a 6 ft -02 guy who weights 275 pounds in the palm of his hand.
As far as the bulk, he is probably heavily into fitness, jail can do that. He may even be getting hormone replacement therapy.