He just havent been training like usual thats all. Dont for get when they active they automatically swell up from picking mofo up and being slammed every night.
Its not healthy to have all that weight on you at taht age especially for no reason. If you havent notcied alot of wrestlers that where swoll back in the days slimmed down(utimate warrior, hulk hogan, lex lugar, the undertaker, sting, hacksaw jim duggan)