#1 To play the numbers game in the upcoming Royal Rumble match
The best thing about the Royal Rumble is the anticipation, of not knowing who it will be that steps out from behind the curtains. As the clock counts down to zero, the audience has no way of knowing whether the next person that comes out will be a babyface or indeed a heel.
And in this manner, a lot of mini-stories can be told in the actual Royal Rumble match. I mean we say that it's a match where every man fights for himself, but at the end of the day, you seize the numbers game and do what is in your best interests to keep yourself around until the end.
This is why I think that Seth Rollins will use Buddy Murphy and The AoP to clear out the competition and give him a fighting chance during the match. Bear in mind that he's a heel now, so he cannot appear all that strong.
Maybe their combined might eventually eliminate Brock Lesnar?