Nice to see more parallel between Zoro and Kaido.
Zoro destroyed (cut) one giant horn with his flying dragon blaze attack. While Kaido destroyed the other giant horn in his fire flame dragon mode technique.
Something I noticed I don't know if other people have is we haven't seen an upgraded version of Zoro's flying dragon blaze. Every other pre-time skip attack we have seen Post Time skip has been upgrade version of the attack. Add haki to an attack doesn't automatically upgrade it. It feel like Oda is saving the upgrade version for a special occasion or certain opponent.
I can see Oda calling it great flying dragon blaze or flying dragon hell blaze.
Kaido's awakening great flame fire dragon vs Zoro's KoH Dragon Style great flying dragon blaze or flying dragon hell blaze.