#1 "The Fiend" Bray Wyatt
While some Superstars may give The Undertaker a great final match and others would continue to grow as the focal point of WWE, one Superstar could benefit the most from permanently retiring Mark Calaway. The one star who could be as scary, magical, and iconic as The Undertaker, Bray Wyatt.
It makes all the sense in the world, with The Fiend's motives being to avenge everybody who wronged Wyatt in the past. Very few have done more damage to the cult leader than Undertaker back in 2015, as he gained two separate victories over Wyatt that year.
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Seeing Undertaker interact with Firefly Fun House Bray Wyatt would be intriguing, while a confrontation between 'Taker and the Fiend is every bit as tempting as it sounds. Sure, the match probably won't be that good. But the message more than makes up for it, with Wyatt consuming The Undertaker's soul and manhandling him in an unprecedented way.
The story would be great, whether it is inside a ring or in a cinematic setting. A Firefly Fun House Match featuring Undertaker could be gold, with so many elements to cover from his 30-year-long career during the match. Either way, Bray Wyatt has the most to gain from beating 'Taker and retiring him for good.
The Fiend could finally let The Undertaker's career rest in peace. But of course, it all depends on whether he decides to return for one last match or not. Only time will tell. But for now, it seems like the cowboy has ridden away.