#1 An immediate Seth Rollins-Roman Reigns feud
Seth Rollins and Roman Reigns have been kept apart on WWE programming since the brand switch post-WrestleMania 35. Roman Reigns made the move over to SmackDown, while Seth Rollins continued to define his legacy on RAW.
After a year-and-a-half apart, Seth Rollins and Roman Reigns would finally be on the same brand again after the 2020 WWE Draft. But WWE purposely kept them apart, especially because both men were still heels.
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Ideally, Seth Rollins would be the perfect candidate for Roman Reigns' WrestleMania 37 opponent, but that doesn't seem to be the direction they're heading in this year.
It would be a pleasant surprise, but WWE should continue to keep the two men apart, even if one is a heel and the other is a babyface.
When the time is right, a feud between them would be great. The roles would be reversed from their feud five years ago, and it could be a major PPV headliner such as SummerSlam.