At this point you can't really deny that sanji might get coc
He has leadership, will power and diable jambe is the physical manifestation of his will
He's been one of the two wings of the pirate king, brook said him and zoro have the same spirit, zeff said sanji has the same spirit as luffy, he's royalty, his ancestors were actual conquerors etc....
I mean, he's probably the most likely character to get coc, although I have mix feelings about it because if he gets it and we don't get to see a powerful non coc users soon then oda would have just made it clear that if you don't have coc or an op fruit you're fodder, which I don't think he'll do because it's not really his style