@Paperchampion23 i can see shanks vs luffy happening due attacking luffy grand fleet , poison stuff .
Wonder the whole crew got split is part of shanks plan.
Luffy vs shanks is happening at elbaf arc. I don’t think shanks is tanky or fight like katakuri style, but more like kuro or cracker fight style . Shanks is all speed and strong AP , amd strong haki . So luffy need gear 5 and strong haki to defeat shanks.