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So this question is extremely debated. I am noting down the order of which I believe the order is.
Luffy: Ofcourse, hes the captain, 3 forms of haki, gear 4 is a force to be reckoned with
Zoro: 2 forms of Haki, 3 swords style, 2nd highest bounty (although tey are not accurate, for example chopp...