#4 Roman Reigns and The Usos
This would be another possible feud that would require a little bit of Wild Card shenanigans, but if you want to make Styles a top heel, it would make sense to place him opposite one of the top babyfaces in Roman Reigns.
This potential storyline with the Club would give Roman Reigns a direction to go in once his feud with Shane McMahon is over, and the Usos - one of, if not the, best tag team in wrestling and real-life family members - make perfect back up for the Big Dog, and perfect foils for Gallows and Anderson.
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Plus, in a matchmaking sense, it allows for Reigns to be involved in multi-man matches that could lend a hand in helping to keep him fresh physically considering his recent health issues. The Club versus The Bloodline - I like the sound of that.