#4 Batista
Batista was with the WWE for quite some time before he opted out of the company to pursue a career in Hollywood. 'The Animal' won the Royal Rumble match in 2014 and was lauded for his work in the company. While the fans didn't appreciate his win that year, the performer has always been lauded for his amazing work style and the ability to build storylines.
During Smackdown 1000, the performer received a huge response when he hyped up a feud for a match between Triple H and self at the grandest daddy of them all. During the segment, it looked like the two planted the seeds for a WrestleMania match, but with Triple H is currently out due to an injury, this match is not a possibility as of this writing.
If Batista enters the match as a surprise, whether not at #1 as he still hasn't entered at that number in the match, and goes on to win the championship at Wrestlemania it would be a great storyline. If he instigates Triple H for a match down the line, we may see a great match at Wrestlemania 36 that the WWE Universe will be completely involved into.