A transitionary chapter, but a good one, nonetheless. I'm happy we got to see moments of Oden bonding with his family. That was sorely needed.
His little moment with Hiyori was cute. Her song seems in reference to Kaguya-hime. The princess of the moon from the Bamboo Cutter story. She was a princess who asked of impossible tasks from her suitors. Nice tie back to her later occupation as Komurasaki. And now we know why she plays her Shamisen a lot in the present. It's in respect to her late father whom she was unable to play for during his execution.
To the surprise of nobody, Kyoshiro is Denjiro. And the Ushimitsu Kozo. I'm happy we got this as now we're tying up all the loose ends before the fights. His transformation is odd, but its ties to Yokai could make sense. I always thought Kyoshiro resembled a fox, and if you compare him to Onimaru's fox form, you could see the resemblance. I like the suggestion by
@Garp the Fist that he could be a Shimostsuki. The fact thought about going to a shrine located in one of the Shimotsuki's regions is interesting. And the resemblance and connection to foxes relates to Ushimaru who was Onimaru's partner, and since he raised Hiyori, he could've given her the fox mask she occasionally wore while playing the Shamisen.
Now we know he was playing an inside job. And we know why, it's to prevent the traitor that's among the alliance from revealing his identity. He might even know who it is, which is why he's refrained from any contact with his allies. And when he stopped Zoro, we now know he wasn't fighting with any sort of bloodlust. Makes him stalling Zoro look even more impressive.
And now we got Momonosuke's encounter with Kaido. Seems it even calls back to this little moment from right at the start of Dressrosa.
Pretty impressive how far Oda thought about all this. On to Momonosuke, Oden had high hopes for his son. Even thought about him becoming a warrior and getting girls as early as toddlerhood. It makes me a little sad knowing what Momo could've been had Oden lived. He clearly has a desire to be like his father, and hopes to become someone like him one day. However, due to the experiments he's incurred and living without a strong male rolemodel, we meet him as someone embodying traits of the villains who destroyed his country. He is a dragon of similar abilities to Kaido. A beast who ravaged his land and defeated his father. His cowardly and hedonistic behaviour upon introduction echo the disgrace of a shogun, Orochi. His journey is to better himself in the hopes of taking out the men who've done him wrong, whilst shedding himself of his imperfections which act as a reminder.
Toki is dead. That much is clear. She was ranting and raving about the prophecy to as many people as possible, and even did whilst having been shot by arrows. She's even implied to have collapsed. Momonosuke already confirmed there were witnesses to her death. But to my main point, it seems she had more reasons to go into the future than just finding Wano, and that involves something to do with what Oden learned with the Roger pirates. So we can confirm she would've done all she did regardless of Oden's instructions. She knew the significance of what should happen 20 years, but was happy to perish alongside her husband, who she's described as "the terminus of her venture."