#1 Brock Lesnar lays waste to Seth Rollins and Roman Reigns
With Shane McMahon likely to be the guest referee for the Rollins vs Corbin clash at Stomping Grounds, a potential Roman Reigns' involvement (given his rivalry with Shane) looks to be on the cards.
Furthermore, Brock Lesnar's involvement in the match seems like a no brainer. Thus, Reigns could show up during the Rollins vs Corbin clash to even the odds, and he could take out the heels by joining forces with Rollins this Sunday.
Given Reigns' involvement, Lesnar could appear the following night on Raw in a foul mood to wreak havoc. He could team up with Shane and Corbin to decimate both Roman Reigns and Seth Rollins.
This would not only serve WWE's purpose of bringing Roman in the title picture but would also lay down the breadcrumbs for a potential triple threat match between The Big Dog, Rollins, and Lesnar for Summerslam 2019.