Following title luffy should be strongest creature now stronger than everyone in the verse. Shanks just like king dont give a damn about swords eventually can be called weaker swordman but overall strength is different things because there are many other factors, region where a person can develop their unrivalled strength. You are just ignoring other necessary factors especially superior haki. Shank Adcoc > mihawk adcoc which puts him above him. If you gonna cope using zoro adcoc see for yourself what damage it did to kaido.
The shanks doesn't give a damm is headcannon by you .
Can you provide panels of him saying such?
Zoro aCoC did that to Kaido true and is remarkable because he's fresh when it comes to its usage ,he's yet to master it like oden but was able to get close on his first use.
Dunno what this has to do with Mihawk, are you assuming Zoro aCoC use is the limit in damage all aCoC users can do?
Shanks and Zoro are really similar currently frankly.
About your haki call ...
Are you implying that two top tier swordmasters will turn off their haki for the duel?
