I think in punk hazzard oda showed used luffys potencial with vergo and logia potencial with CC , i think CC was a very weak person but his mastery with his DF was as good as crocodile . If you guys watched Luffy vs CC carefully you can see luffy dodging most of his atacks and blue fire also is very dangeraous , sanji has alot of knowledge about fire as a cook so he is also clever so he can use best of it .
I didnt wanted Oda ever introduce that DF but now that its out i dont really see anyone else other then sanji , i understand people doesnt want sanji to eat it ecause that will make him aces successor also WB pirates will be his allies in a blink if they are allive which will make sanji much more important then zoro can ever be .
