Charisma (even enemies getting enchanted by Sanji qualities)
By Sanji being handsome? They complimented Zoro's strength, the rare thing that is seeing him as something different than the captain, his killing intent, a willpower strong enough to chase eitehr die or accomplish his dream and then you have ppl like Yasui that ended up following him basically because of his charisma. Did they comment about Sanji regarding this things?
Leadership (leading multiple groups)
Fair point.
Willpower (giving his life for the group and acting as a protective guardian of the weaker members of the group, and Zeff himself recognizing that Sanji has a similar willpower to Luffy's)
Being a protector doesn't mean that you have a lot of willpower. It just means that you are willing to protect the weaker. Which is basically Sanji's job in the crew. And well, i didn't see that willpower when he kicked Luffy. Someone with a lot of willpower will fight against something unfair. Sanji just went with it.
Portrayal (every time CoC was used in front of Zoro and Sanji, both have special panels)
Sanji: "So he really does have the talent". Nothing spectacular.
Zoro: "That's what I expected from a guy who calls himself my captain".
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Like, look at his situation with Black Maria. Do you imagine Roger, WB, Oden, Luffy, Rayleigh... etc screaming "Robin help me". Yes, I know that she is a woman but what is he going to do? Use a selective CoC blast so he doesn't knock out women or is he going to knock them out just to cry after that?