Not one person talks about Ryuma except Onimaru and Kawamatsu. Kawamatsu already acknowledged him. There's no "plotline" saying the citizens need to recognize Zoro as Ryuma's heir by killing Kaido lol
Kawamatsu doesn't matter. It's either Kaidou or the citizens of Wa No, who should be acknowledging the second coming of Ryuma.
And I never said a single thing about ZKK. Just a second confrontation resolving the Monster Samurai and Ryuma plotlines.
And not really....it will be addressed in another arc.
Oda wouldn't leave it like that imo.
If he wanted that to happen in another arc, he can very well write that scene at the end of Wa No. But he did it right before the raid. Luffy will be acknowledged as the second coming of Joyboy exactly like how Zoro will be acknowledged as the second coming or Ryuma by the citizens and as the Monster Samurai by Kaidou.