#4 It's revenge time for the Beast Incarnate
The entire story for Brock Lesnar vs Cain Velasquez in WWE has been about Cain being the one man who has dominated Lesnar and who Brock has not yet "conquered". In the press conference before SmackDown, where the match for Crown Jewel was officially announced, the Beast Incarnate took to the mic to describe how he's been waiting for this moment for the last ten years.
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The narrative is that while Mysterio has brought Cain to avenge Lesnar's attack on him and his son Dominik, Lesnar is equally hungry to get revenge on Cain for the scar that he left on his eye during their famous fight at UFC 121 in October 2010.
While Brock is supposed to be the heel in this storyline, the way Cain has dominated him makes him look very vulnerable. Add to that his promo during the press conference, and you can't help but sympathize a little with the WWE Champion.
It is indeed personal for Lesnar, as unlike WWE matches, UFC fights are not scripted, and the loss to Cain in 2010 did hurt his legitimacy for real. Another loss, even though scripted, might leave a big mark in the otherwise successful career of his. Will Vince allow someone to do that to his Champion?