#5 Seth Rollins
There’s a sense in which Seth Rollins ought to be the favourite to win this tournament. Most critics would agree that he’s the best all-around performer in the tournament field at this point, and in particular the best from an in-ring perspective. He’s also the guy most fans would agree is actively in his prime right now, and someone WWE could believably transition into a world title picture whenever it pleases.
It’s far from outside the question that Rollins could win this tournament. However, at least for the immediate future, Rollins is playing Roman Reigns' sidekick in the Shield. The King Slayer is the Intercontinental Champion and looks to be either tag teaming or feuding with Dean Ambrose for the foreseeable future, neither of which make him altogether compelling to win this tournament (more so, Ambrose costing him a tournament match seems likely).
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Unless WWE means to transition to a Shield three-way feud, or otherwise move more quickly than it would appear in getting Rollins back to the main event, he probably isn’t going over here.