Given my schedule I should be in bed instead of staying up watching my pirate cartoon but what can you do?
Won't say much at the moment other than that was really nice. Ito didn't really expand ''much'' on Kaido's flashback compared to what was in the manga (much like when he did the bit of Roger at Laugh Tale) but just giving the material room to breathe instead of cramming it into small, cluttered panels elevated what was there so much and made it feel like that much less of an afterthought. Not to mention the direction and animation did so much for it; I'm not surprised that Chansard got to draw a lot of Kaido's younger selves. Out of all the animators who handled the character during this long arc he really owned that design and all of its forms.
So ultimately it wasn't Shida who handled the finishing blow but Tu. No surprise there really, lol. Most of the big regular names popped up here and there throughout the episode - Shida, Tomita, Thurlow, Chansard, and Tu, etc. - but there were still a few surprises like Toshiyuki Sato (big-name freelancer who's all over the place) and a couple Studio Pierrot Naruto team regulars, probably thanks to Thurlow, - Masayuki Kouda, jay1jay1jay1, and Chengxi Huang. I suppose they could use the work now that the Naruto/Boruto anime has finally been put out to pasture!