Yates trained at Golds near Waikiki when he was in town for a guest pose session before his last couple Olympias. Photo's don't do him justice he was the biggest driest dude and he was still weeks out from competing. His cardio was riding the stationary bike and he dwarfed the poor bike thought it would fall apart.
Also, no disrespect to Haney, he trained at Power Pit near Pearl Harbor in his later Olympia years, and he was tiny compared to later Yates. Yates must have gained 40-50 lbs between his first olympia to his last.