Man, the art's changed so much since the early chapters. Compare Kaji in page 2 with Kaji in ch. 52, there's so much more detail.
Gakuto had to be backed by both Hachina and Kaji to come this far against Lacy. He's quite a threat, it seems. Also, it came to my mind that Kaji's not actually aware of the rule hidden in plain sight, is he? I don't know if the rules were explained to him by Gakuto or if he was only aware of what Mogami explained once he re-entered.