Roman definitely came back to smackdown last week with a little chub, nothing major but more then he had a few months ago.
Jericho and Mox were two of the biggest examples of dudes getting really chubby, but I think it's safe to say drinking was a major reason for that. Mox came back from rehab looking much better and Jericho has gotten himself back into good shape.
Cole was always small, but he had more defention in NXT, especially during the height of UE's run. I never got the impression he wanted to live in the gym to the point he would need to to stay that cut just from reading newer interviews of him or his twitch stuff.