Zoro doesn’t have conquerors, at least yet, but that’s because he hasn’t used it like someon like Luffy or mars who use it to knock out people. His swords have the conquerors, maybe this is what it means by Enma and the other sword being cursed? His conquerors is stolen by the swords and released at moments. Since if the vivre cards say he has never had it maybe its his swords? Plus zoro has never used conquerors besides in his swords