#2 'Stone Cold' Kevin Owens
For far too long now, the main guy on WWE has been a person that the management has pushed there whether they belong in that position or not. With backstage relationships among the management and individual Superstars being public knowledge now, it's more difficult for Superstars to be obviously supporting the management on one hand behind the scenes and be a 'rebel' outside.
'Stone Cold' Steve Austin was able to play the rebel to great success, as even though he was always very pro-WWE, he was able to be the person that spoke up when something was wrong about the way the company was doing things in kayfabe.
Kevin Owens has that same believability and his feud with Shane McMahon was absolutely incredible. The fact that Owens is ready for anything and everything and is always dedicated to whatever role he is playing in the company means that he can do what it takes to make this version of himself believable as well.
Playing a rebel underdog against a possible heel Seth Rollins would be an incredible storyline for KO.