The question i have is... say, hypothetically, Brock was able to work Wrestlemania and face Undertaker. Which one would job? I can't imagine Brock throwing away his UFC career to job in a one-off gig at Wrestlemania, and i don't believe Undertaker's WM streak is likely to end (maybe his final match, but not yet at least), especially to Brock for a one-off match deal.