#1 Bray Wyatt
6 years ago, Bray Wyatt made his way up to the main roster by attacking Kane and eventually defeating him at SummerSlam. Wyatt's second coming as "The Fiend" could be given a poetic twist. His return could see him challenge The Undertaker for a match at SummerSlam, in what Wyatt would dub as his revenge for the defeat at WrestleMania 31.
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Wyatt has 'forgiven' several WWE wrestlers over the past couple of months, but hasn't done the same with The Deadman. He could come out and state that Taker's sins were unforgivable and that he needs to be punished for committing them. Bray's return will mimic his 2013 debut at SummerSlam, and his new character will benefit a great deal if he ends up defeating The Undertaker in a clean manner. This could be acted out as a "passing of the torch" moment, with Wyatt putting down Taker for good.