First, I've actually never heard anyone complain about lack of personality in athletes. In fact, most people complain about too much personality ala TO, Chad Johnson, Lesnar, AI back in the day, etc. Having said that, I don't have any problem with Brock's personality, because people want to pretend that MMA is stictly a sport, but at the end of the day, it is still a fight, and emotions run rampant.
The only reason Carwin didn't finish Lesnar is because he gassed or cramped, or had lactic acidosis or however he explained it. I see Lesnar have trouble taking Cain down, and Cain definitely has advantage on the feet. Cain is incredibly strong as he displayed against Rothwell, but stronger than Lesnar.. not a chance. I have gain winning this fight, but respect that Lesnar is an incredibly conditioned monster, so it will be fun to watch.