The Rock, who is in play for WrestleMania 31, could no doubt be talked into facing his cousin. The story write itself: It's a test. The Rock comes back to see if the hype surrounding Reigns is real — to see if he's capable of the same kind of success "The Great One" achieved in WWE.
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That match would be basura. I'd still love to see these two tussle in a ring tho...for reasons.