Shanks is never meant for Zoro and will never be. We just finished from this delusional ZKK and the next fanfic is Zoro vs Shanks? Zoro fans really be wanting Luffy’s opponents so bad. Either way Zoro surpassing Shanks is one thing and needing to fight him or the one who defeats him is another. It’s like saying Luffy has to defeat all yonko and admirals with his own hand just cuz Chinjao and Luffy claimed they need to do it. It simply won’t happen all he needs is beat the strongest and that’s it.