#2 A Family feud
With Roman Reigns replaced at WrestleMania, Braun Strowman won the Universal Championship and immediately started a feud with Bray Wyatt, the man who brought him to the dance. The two spent months at odds with each other, with The Monster Among Men facing all three of Wyatt's gimmicks.
Strowman defeated Firefly Fun House Wyatt at Money in the Bank, before engaging in a chaotic Swamp Fight against his former Wyatt Family leader, the 'Eater of Worlds'. SummerSlam saw 'The Fiend' Bray Wyatt take the Universal Title from him in a Falls Count Anywhere Match.
There were a lot of layers to this story, as there were in Strowman and Wyatt's respective battles with Roman Reigns. Five years ago, WWE fans witnessed the birth of the Monster. It started alongside Wyatt and opposite Reigns. He faces both men on Sunday, with the opportunity to win back the Universal Championship.
Braun Strowman is unlikely to leave Payback with the belt, having just lost it. Roman Reigns' SummerSlam return has shifted the focus away from his rivalry with The Fiend. However, it could very well spark a new beginning, in the form of a poetic reunion between Strowman and Wyatt, just like in 2015.