All he needs to do is take it to the ground and she's fucked. He has like 60lbs on her and way more strength. And this would be the natural thing for him to do.I'm with Ava on this one. One doesn't need to be an international level MMA fighter to outclass anyone without training. In most cases not even basic moves may be countered by brute strength alone. Take boxing for instance: if your guard isn't where it's supposed to be you're going down no matter what. Most martial arts teach moves that will block, hinder and then counter the opponent in one fluid motion. If you're not trained to break their flow these moves will connect. In most real world fights it's about successfully landing the first blow. Having any sort of training significantly raises the odds of doing just that.
He would be naturally averse to punching her (who wants to punch a little girl in the face? no-one), he'd want to grapple and bring her down and get her to submit/giveup because she doesn't have the power to dislodge him.
Yes, a Jiu Jitsu pro would beat a Wrestling pro (in this example she is a skilled JJ and he is an unskilled Wrestler) but, and here's the kicker, they must be of equal(ish) weight.
Aiko and the PC are not anywhere near equal weight.