4- Randy Orton
The newly crowned unified champion still doesn’t have a credible opponent other than John Cena, Daniel Bryan and CM Punk on the roster so putting Batista directly in the title picture through Royal Rumble would be the simplest decision that the creative could make.
If put this way, Cena could fill in as a challenger for The Undertaker while Punk and Bryan could go up against Triple H and Shawn Michaels respectively to give a stellar card for the 30th anniversary.
The two also have a lot of history to reignite and the chemistry between them promises to produces fireworks though it lacks the freshness. The feud would also bring Batista into the centre of the Authority angle making his return more hyped than any other possibilities.