I've only talked about this personally with a few people, but if:
- Zoro is Ushimaru's son and was sent to Shimotsuki village in East Blue. Roronoa is his mother's name.
- Said deliverer of Zoro also notified Kozaburo, the maker of Enma and Wado Ichimonji, of Wano's tragedy and of the "9 shadows returning in 20 years" prophecy.
Could this then be Kozaburo heading back to Wano? During the promised time of dawn?
He wouldn't know Crocus directly, but THEY would know Zoro and subsequently the Strawhats. This man, someone clearly with a Wano hat, also clearly coming from one of the 4 blues, but which?
Subsequently the 2 swordsmiths of Enma (Kozaburo) and Ame no Habakiri (Tengu) meeting again after 50 years? Both Swords being used to save Wano?
Will this person appear very soon? This chapter has certainly gotten me thinking now that Zoro is very likely to be part of the Shimotsuki bloodline. Funny enough, all 3 of Zoro's blades now come from both of these people.
Finally, Kozaburo could be the one person who can directly tell Zoro where he comes from. Kawamatsu and Hyou are just pointing out that he looks similar. It doesn't seem that neither know he's literally a Shimotsuki yet.