Respectfully, I think you still don't understand what I meant. Sanji has yet to unlock his exoskeleton, we don't know. Even if he does, it will be later.
In East Blue, whether you believe Sanji is a modified human or nah, he joined as a normal human. If he joined with exoskeleton activated, then that's something else. This is how the categorization came into being, at that time, Sanji is a normal human who kick hard. He's not introduced as special human with ability.
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I may not like Yamato, but if Jinbe's Japanese outfit theme can be "copied" from Zoro, then I guess having Oni theme on Yamato is perfectly fine. Besides Yamato has horns, in which Jinbe doesn't.
The same goes for Carrot. In my defense, since Jinbe can have the same "theme" as Zoro, then it's fine for Carrot which has the same theme as Chopper.