AD has a pro physique, he just doesnt come in as shredded and dry as he needs to be. He only looks big onstage when he is cut up, because he is more of an aesthetics guy with a small waist and doesnt have cutler type size. when he is lean enough, like when he won his pro card and the few attempts before that, he looks sick, and huge too.
but kyomu your right its because he doesnt like to diet.