#4 Brock Lesnar comes in and wreaks havoc in the main event
Revenge is a dish best served cold. But for Brock Lesnar, he is not just seeking revenge, the weakened and broken monster needs to establish his dominance once again. At Survivor Series, the Beast Incarnate was defeated in an astounding 86 seconds.
While there was criticism of the Conqueror being conquered in a complete squash, it did allow fans to see that anything could happen at any point in time. And for Lesnar, it is best to simply get up, dust himself off and return to being what made him what he is. And what he is, is a dominant monster that destroys everyone and everything in his path.
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He could absolutely destroy the Raw set, and do the same to whatever men have the misfortune of being in the ring. He might show up during either the tag team or Cruiserweight Championship matches. However, if he were to come at any point, it would make the most sense to be during the main event.
His rationale wouldn't be because he had an issue with Owens or Reigns, but rather because, in order to be heard by management, he would have to appear at the most pivotal time in the program, the main event.