I would say don't underestimate Lesner. He's about as focused as they come. He's genuinely a mean, ill tempered person and really a machine.
As sort of outside looking in on MMA (Not really invested in it. Too many wannabe jack offs running around here with Tapout gear and bald heads for me to want to associate with it) I can tell you what Lesner did at the end of the fight helped MMA a LOT. I have never heard of an MMA even being discussed on national sports radio for ONE whole day, not to mention TWO whole days. Lots of that was due to Lesner's antics.
As he said; He is used to performing on VERY large stages and in the WWE he was generally a "heel", or the bad guy (As opposed to a "face", good guy). He just did what he was programed to do. The owner of MMA put a boot up his ***, and, rightly so, but Brock was just doing what he had to do. In the wrestling industry it's called "pop". "Pop" is crowd reaction. It can be cheers, or boos. Doesn't matter which. "Pop" is always good.
Think about it. MMA fans will either want to see Lesner fight and win, or fight and get beat...Sort of like Bisping. Lesner's stuff may well start to bring in the sideline and fringe fans that bring money into the sport, as well as exposure. That's how you get ESPN pimping your product.
I will admit I paid lots closer attention to MMA before and after this event. I'm paying closer attention now. I'm not on board completely yet, but, I can see myself edgeing closer.