Josh seems pretty sensible and has a frame that can handle the mass he has. Also keeps himself lean.
Obviously not natural and anyone who thinks he is or was serious about saying he was is an idiot.
On my list are King Kamali, Ruhl, Valentino, Coach Trevor (you can hear it in his breathing) and Kai Greene. Rolly also on the list and I would add Gaspari due to likely enlarged heart and massive historical dose anadrol user.