FYI ZKK inches closer every chapter
Zoro's Flying Dragon Blaze is one of the biggest "unfired Chekhov's Guns" in Wano right now.
Chekhov's Gun Principle states that an item/element must play an important role in the story when it's introduced to the reader in a way that suggests dramatic significance. If a gun is seen in the first act, it should be used by the third act in a story following a traditional three-act structure.
Flying Dragon Blaze is the one attack that Zoro posed like Ryuma before swinging his sword.
Oda foreshadowing that Kaido will meet his end to an upgraded CoC variation of Hiryu Kaen (Flying Dragon Blaze)