Yes, one of the key traits of a CoC user is their ability to gain allies, or subordinates which Sanji has done on several occasions.
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Headcanon to say it's his "best moment" Sanji's character arc regarding his family isn't even over yet
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I don't see a problem. Sanji was the first to get his own big dedicated arc, he was the first among the 2 to confront and fight a Yonkou, he was the first to fight commander-level characters from a Yonkou crew. SO why can't Oda give him COC first?