The Ace of Knaves
Getting Noticed By Management
Very good in the sense that he is a top heel and 1 of the few new stars they have. The only worry is if the top face feuds have dried up so that it won't be something new, but even then they would still have the Deadman for him to face. Seems like Undertaker will be pre-occupied with Kane and Sheamus will be with HHH until around Rumble time then they can build Mania feuds from there.
I think it also depends on how much longer this title reign is. If he holds the title until October/November then i cant see him having it back in time for Mania because the title reign in between could be too short to be anything more then transitional. But based on Sheamus' ability and the possibility of who he could face, yes he would have a very good chance of being main eventing at Mania.
If Sheamus vs Undertaker happens at WM 27, it would be a horrible match cause there's no way it could follow Taker vs HBK twice. And yet another mistake on leaving Jericho or Cena out of the list, just like picking Giant Gonzales over Hulk Hogan, King Kong Bundy over Bret Hart, Big Boss Man over Mankind, A-Train over Benoit, and Mark Henry over Kurt Angle.