Sea level Cain is bullshit to me. Not that Cain isn't a badass at sea level, more that he fought like a badass in the Mexico City fight against Werdum as well. I rewatched that fight last week and Cain was pressing forward with constant pressure the entire fight. The only problem is Werdum was outstriking him an countering his pressure extremely well. The entire time Cain is applying constant pressure yet losing exchanges Rogan is incessantly going on about how the altitude was affecting Cain. Which is understandable if Cain had ever slowed his pace down, but he didn't.
Mile-high Werdum is a more real thing than Sea-level Cain IMO.