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Busoshoku != Busoshoku Koka. Hardening is Koka and is a superior application of Busoshoku than ordinary coating. Law hasn't hardened his blade. Many people that have used COA haven't ever used hardening. Sai went through an entire Awakening for his hardening back on Dressrosa.

Fixed that for you. Nope. COA is "Busoshoku". Hardening is "Busoshoku Koka". Hardening is more difficult than ordinary armament.

Where's Sanji's hardening though?