The Big Dog and The Beast have unfinished business from WrestleMania 31. They never fully resolved who the better man was, as Seth Rollins came in and stole the match. That left money on the table for Reigns and Lesnar going back at it, fighting this time to a finish. It would make sense as a WrestleMania 32 main event, and if Lesnar beats Taker at Hell In A Cell, it would make sense to then put over Reigns at Mania. That's been the long term plan all along. What could also end up happening, is a triple threat at WrestleMania 32. The Wrestling Observer Newsletter reports that Rollins as WWE Champion versus Lesnar versus Reigns could be the direction WWE are thinking towards. It would certainly make sense, as there's unfinished business between all three men.