Zoro, bud created an entire style since he was 6 and was like, oh this seems cool, I’m gonna do this to beat people, and that’s what he does and he’s been doing it since he was 6, he beats people with not one, not two but 3 swords, and sometimes even none! He also uses other sword styles and learned a sword style from a random ass perv in less than a week just by hearing and seeing him use it. Zoro can just add fire to his sword if he wants, without anything. Sanji is just kick, and fire kick, and hotter fire kick, that’s it.