#2 Big Cass
Big Cass suffered a severe ACL tear during a street fight match with former tag team partner Enzo Amore during an episode of RAW in August. Cass has been out of action since then and is rumoured to return around May.
If that is indeed the case, then he will have to miss this years Wrestlemania but there is also a chance that a quicker recovery will allow him to be in a condition to Wrestle by Wrestlemania.
Big Cass could enter the Andre the giant battle royale as a surprise entrant and win it since a program with Enzo would have made sense if Amore was still employed by WWE.
Another angle that Big Cass could be put in is a match against the Monster Among Men, Braun Strauman and we could get to see a battle of giants to see who reigns supreme. A win against Braun at the Grand Stage would definitely put Cass's career back on track.