As for the fights itself, they are all amazing. Momoko's actress indeed put her A game in this episode as she was able to convince us that she is indeed a tai chi practitioner and that she can use her tai chi skills in battle. Her entire fight sequence with Kotsuhi without any of them transformed is what I can say the highlight of this episode. It's just pure and awesome kung fu fun that will just leave you in awe after watching it. After watching this episode, I suddenly wished that Momoko should have more character focused episodes. That's how awesome Momoko is in this episode that you want to see more of her in action.
Having Momoko as the target for this plan is kinda interesting, but if there is one thing that I am bothered with it is the fact that from all people, why Momoko? I guess they have this impression that she is the weakest from the five but after watching this episode, it made me realize that all five Maskmen are equally strong, they just specialized on some martial arts field. Because of Momoko's injury, she can't pilot the Great Five and the Maskmen have no choice but to enter Great Five's cockpit without Momoko.