Finn Balor
Similar to Aleister Black, this would have been a great match that would have seen two characters with supernatural overtones that could have been a true spectacle at WrestleMania.
Balor has been around a little longer on the main roster than Styles, so since he was known to bring out the Demon on special occasions, this could have easily happened at some point over the last five years.
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If they didn't deem it worthy of a 'Mania spotlight, then it could have easily been a match for SummerSlam or another big PPV during the year.
It would have even been a good match at a potential PPV in the United Kingdom if they wanted to really pop the audience.
But Balor isn't one of the favorites of Mr. McMahon, hence his constant failure in big-stakes matches after he got hurt winning the Universal Championship.
It's a shame because it would practically write itself, but WWE hasn't always run with easy things the fans want when they have looked them right in the face.