#1 Jimmy Uso betrays Jey Uso and joins Roman Reigns
Jimmy Uso has been sitting on the sidelines for a long time now, watching his brother live the sort of life he wanted. He got a singles run, and although he failed, he has proven that he's a capable main event star.
Jimmy Uso might not have taken that completely well.
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At the same time, Roman Reigns is not too happy with Jey. The latter has failed many times when Reigns needed him, and as a result, he has been harsh on the superstar.
As a result, there could be a storyline where Jimmy Uso betrays his brother by taking his place in Roman Reigns' faction. This could lead to Jey Uso being kicked out of the faction and turning face yet again. He would then feud with Jimmy and Roman Reigns, leading to several more interesting storylines.
Jimmy Uso is still seen as somewhat of a face by the fans, and this could be a shocking turn that no one saw coming. It would help build Jimmy's credibility while allowing Jey to do more than be a lackey.