This is a great way to explain it. If I may add, it's the same thing that we do with devil fruit users.
Luffy is a devil fruit user
Law is a devil fruit user
Kid is a devil fruit user
Luffy's fruit has been weak until awakening
Law's fruit has always been stronger than Luffy's before gear 5
Kid's fruit has always been stronger than Luffy's before gear 5
Luffy uses all forms of haki and has strong haki
Law barely uses haki
Kid barely uses haki
If we ignore for a second that Luffy has the sun god Nika and still has a "rubber fruit".
If we had to give the epithet "world's strongest devil fruit user", who would get it?
Shanks defenders would say that Law is the "world's strongest devil fruit user" because he has the strongest devil fruit.
However, in reality, "world's strongest devil fruit user" epithet, if it uses the same kanji than WSS, means "the strongest among all devil fruit users".
So, it's Luffy who would have the epithet among the three because he has the strongest haki and so, it puts him at the top of the devil fruit users. It doesn't matter what he uses to defeat them, he is a devil fruit user and so, he is in that competition.
Now, apply this same exact logic to WSS and Mihawk/Shanks. The epithet means "the strongest among all swordsmen".
Following this logic, you can understand there is:
- the strongest among all devil fruit users
- the strongest among all swordsmen
- the strongest among all punch users
You could argue that the epithet "the strongest man" or "strongest creature" is for the person who is really at the top and is the strongest among ALL PEOPLE.
The WSS could be the strongest man if he defeats other people than swordsmen.
@uyuu