I thought the same thing. I don't mind Sheamus but he isn't exactly screaming Main Eventer here. I would of rather seen Miz or Swagger in this spot for sure. Hell i would of wrote Ted Dibiase in this spot.
Basically keep pushing the Marine 2 movie. So come time for the battle royal it is down to Kofi, Orton, and Dibiase. Orton is in the process of throwing Kofi out and Dibiase dumps both of them.
Next week on RAW orton confronts him and wants to challenge him for his #1 contender spot. Kofi interferes and costs Dibiase the match.
The following week we get Legacy vs DX match. Jerishow interferes and Dibiase gets the pin on HBK.
The week after that it is Legacy vs Cena/Kofi. Well Orton interferes costing Kofi the match and Dibiase gets the pin on the hottest wrestler in WWE Kofi Kingston.
The whole time they keep playing up the Marine 2 being better then the original Marine.
I could buy that as a sub main event to Batista vs Undertaker. Hell it would go on before DX vs Jerishow too. A card that features
Orton vs Kofi - No Holds Barred
Dibiase/Cena - Table Match
DX vs Jerishow - TLC
Undertaker vs Batista - Ladder
Isn't too bad in my eyes. Hell throw in some sort of US title scramble with Miz, Swagger, Bourne, and MVP. Then Punk vs Truth and Morrisson vs Ziggler its not too bad of a card.