MMA math seldom holds up though.
I think Cain's best bet is his faster, crisper hands. I don't think he can KO Brock with a single punch, but if he can keep it standing (which is a big if) long enough I think he'll have a decent chance of beating Brock. He also isn't going to gas like Carwin did.
Still, I think the odds are in Lesnar's favor.