#2 Brock Lesnar could feud with Roman Reigns over Paul Heyman
Speaking of Paul Heyman being the center of attraction in one of Roman Reigns' feuds, we could see the Universal Champion be met by a very familiar foe, in Brock Lesnar. The Beast Incarnate might have a problem with the recent development of Heyman aligning with the Big Dog.
Much like a possible feud with Braun Strowman, this could lead to a different take on an old rivalry. Lesnar could be the babyface looking to avenge Heyman for quietly betraying him, by trying to take down Roman Reigns. The action between the two men has always been good, even when the story was off most of the time.
This feud could also spark from both Reigns and Lesnar competing to be the superior 'Paul Heyman Guy'. It would certainly lead to the most intriguing installment of their multi-year storyline, which has headlined two WrestleManias in the past.
A program between Brock Lesnar and Roman Reigns would be the big money sports-centric angle on SmackDown that FOX paid WWE for. This is the only way for it to happen, without risking fan apathy. Maybe the two could even reignite the fire that they started at WrestleMania 31, the site of their one truly great match.