This is like looking at a blurry ufo shot and claiming it as proof of aliens. First it will certainly be shopped when we see it if it comes from kai. Second, it is his back (best body part with hams) in isolation. Wolf gets so much shit for calves why would a chest shot prove anything? Wait til the show but I think he will be huge with out of control gut. No matter his conditioning he won't win if he has that massive gut.
