#3 Roman Reigns
While Edge may have returned on Monday Night RAW, there is nothing saying that he couldn't face Roman Reigns in the future. Like The Undertaker, Edge is technically a 'free agent' who could move to whatever brand he feels like.
One of the defining aspects of Roman Reigns is his heavy reliance on The Spear. The move has been utilized by several wrestlers, including Batista, Goldberg, and Edge himself. Thinking about it now, both men actually use that move as their main finisher.
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Wouldn't it be interesting to see who is the true King of The Spear? Yes, there is the invisible line of WWE SmackDown and Raw being seperate brands, but such a match doesn't need to happen in 2020.
Imagine if Roman Reigns took on The Fiend at WrestleMania 36 and wins the WWE Universal Championship. Wouldn't it make for an awesome SummerSlam PPV to see the two square off and have Edge have one last shot at the title? At this point, it's nothing more than fantasy booking but wrestling fans can dream.