Mir's trash talk was elegantly over the top for their first fight. This time around, I get the sense he really believes his own hype, or at least badly wants to believe his own hype.
Upon objective reflection however, we see a clear pattern: Nogueira has been knocked on his rear end in every single UFC fight. Not only that, he's looked slow, flat footed, and his ability to avoid punches has been close to non existent.
This suggests that Mir took advantage of a fighter with a massive deterioration in his standup game, rather than pointing to any miraculous improvement in Mir's striking.
A more cautious Brock will KO or simply pound his way to victory after Mir is dazed by punches and/or elbows. Brock has demonstrated explosive power with knee strikes on the ground, and elbows and punches standing.
Anyway, expect a lot of hate against Lesnar for his ridiculous size and athleticism, and for his background in sports entertainment.