Mir seems to be thinking that Lesnar isn't going to get any better. Take Lesnar vs Mir I and compare it to Lesnar vs Couture. Lesnars striking improved greatly, his MMA wrestling actually got better, and while he seemed to be gassed he kept going at Couture's pace which is no joke. Mir also is talking about weight difference, 20lbs may not be alot because he was dealing with guys who would stop eating donuts to make sure they made weight, Brock is coming in 20lbs+ of muscle. I think Mir will probably test Lesnar's chin, and unless it is made of glass shortly after Lesnar will test Mir's again. We saw what happened last time when Lesnar tested his chin, it failed, and you can't really improve your chin.