It's a (hysterical) publicity stunt. If Chambers plays in Super League he'll get humiliated, and I'll give you two reasons why:
1) He plays on the wing, and to do that you need to be good under the high ball and strong in defence. If he played and I was coaching a team against Cas my instructions would be simple - bomb it to his wing. I see a silhouetto if a circus jester.
2) He'll get targetted. If there's anything in RL that we hate, it's people who are too big for their boots or act differently from everyone else. Chambers is an arrogant tosser anyway, but he'll get the biff brought back on him, big style.