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?
		
		
	 
				 
 
		
 
 
		
 
 
		 
 
		 
 
		