His shoulders are insanely round!
He has had so many trainers and has done some many different training techniques... something must be working for him, he has managed to get bigger and harder every year.
This guys is a fucken freak in person, i know in the onstage pics he isnt that great but in person he is amazing. He has a thick ass neck from the back and his muscles are crazy
EDIT: I youtubed him and check out this video, he looks fucken amazing. make sure to watch it in HD.