Discussion - Akainu's Ability

Busoshoku Haki granted the user the ability to touch Devil Fruit user's true body but it doesn't cancel out the Devil fruit's effect. So having Busoshoku Haki doesn't meant automatically ownage against Logia users and or having the upper hand against Logia users still because of their Devil

Character Discussion - Akainu's Portrayal Revisited

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Discussion - Akainu's Ability, Page 2

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Discussion - Akainu's Ability, Page 2