#1 Roman Reigns pins Joe clean
As mentioned, the day after WrestleMania and before the superstar shakeup, Joe came out to address Roman Reign's losses to Brock Lesnar. He was trying to discredit Reigns' heart, his effort, and his character. His effective promos ensured that fans would jeer everything Reigns would say and do.
It is understood that it was Joe's role to discredit Reigns, but what shouldn't be ignored is that, during this entire time, the recipient of the barbs would sit silently and listen to everything Joe would say.
The following week, Reigns had all he could take and told Joe to come to the ring, put his threats into action and do something about it. After teasing a physical confrontation, Joe ultimately walked away, leaving the Big Dog in the ring-hungry for more.
It would do Reigns a great service to have him walk away from the victor against Joe, and would be best if he doesn't just win but wins cleanly.