#2. Roman Reigns vs The Fiend may already be in the works
Roman Reigns vs The Fiend is currently rumored to be in the works. We have already published a feature as to why Reigns vs The Fiend should happen at WrestleMania 36. You can check it out here.
We know that The Fiend is currently the hottest character in WWE and Vince McMahon has big plans for him. Main eventing WrestleMania could be one of them. Roman Reigns, on the other hand, is the company's poster boy. He can't be kept away from the main event scene much longer without losing credibility.
Reigns is the face of SmackDown and it isn't fair to keep him away from the title scene. He hasn't even been allowed the opportunity to challenge for the title he never actually lost. If this match is indeed slated to happen, then Vince McMahon could allow Roman Reigns to win the Royal Rumble. It would provide him a direct opportunity to fight for the Universal Championship. WWE can plan the build-up later.