#3 Triple H
Revenge is a great motive in pro wrestling, and that could be exactly what Sting is out for after losing to Triple H at WrestleMania 31. Of course, WWE will probably have to rely on run-ins from The NWO and D Generation X to keep the pace going and cover-up Sting's shortcomings, but the pieces are still there to tell a great story.
Beyond that, it finally gives Sting a chance to even the score after losing to Triple H at WrestleMania 31. While the win wasn't that big of a deal, especially since both Superstars were part-timers, some fans believed that the company was still holding a grudge with WCW over The Monday Night Wars.
If nothing else, it wouldn't hurt WWE to give Sting back the win he never should have lost in the first place. Secondly, it would be a nice return match for The Icon and it will hopefully help him gain momentum going forward. Who knows, maybe it could even lead to a part-time comeback and even some dream matches that fans are dying to see!