He still couldn't use it at will, doesn't really changz that couldn't infuse his haki onto his blades till hz got Enma, we saw the difference it made once could emit in all three swords... also swordsman don't need internal destruction as much as someone like Luffy, except Sentomaru and people...
Is isn't just ID, emission is also the advanced version, Zoro could only use hardening till Wano, yh scabbards and others could use but it made sense, Wano was a land of samurai so infusing it with their blades was understandable.
Flames = ACoA emission (ryuo)
King of hell is when he is using both emission and conquwror coating with three swords.
Asura... manifestation or something like that.
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