#3 No actual wrestling
Brock Lesnar is still, years after making his debut, one of the most brutal and feared wrestlers on the WWE roster. There is not another Lesnar-type wrestler in WWE currently. And for this reason, and to hype up the SummerSlam match, Lesnar has to wrestle on his return to RAW.
He could perhaps face Bobby Roode, Elias, or a returning Jason Jordan and finish them off quickly. I don't think I or the WWE Universe would want to see a Lesnar vs Reigns match on RAW, while a brawl (with the roster separating both wrestlers) has been used many times by the WWE.
LMAO. Check out who just called Becky Lynch 'tiny' RIGHT HERE