#1 Roman Reigns - SmackDown Live
Roman Reigns coming to SmackDown Live probably has the smallest chance of happening, but it would be an incredible move.
Just like AJ Styles dominated SmackDown, Reigns has dominated Monday Night Raw since the brand split began. Whether fighting for midcard titles, tag team championships or the big red belt, Reigns has always been prominently featured on the flagship show.
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Reigns had some of his best feuds against Seth Rollins, Bray Wyatt and some of the other members of the Raw roster, so there's very little for him to do.
On SmackDown Live, Reigns' presence would elevate the show the same way John Cena did when the brand split was revived in 2016.
There are a pantheon of great rivalries and matches for The Big Dog on SmackDown including revisiting his feud with Daniel Bryan, Samoa Joe and Randy Orton.
If WWE is serious about making SmackDown a bigger show when they move to FOX, Reigns's presence would be a great help.