Most unstable power system awards goes to one piece manga :)
If oda thinks mihawk is stronger than shanks , he did not put additional thing like skill . Just he would put suprass word. Oda making trolling all time
Thats just not it, imo Oda just makes sure that both DF and haki get their own recognition as their own fighting power independent from swordsmanship / sword skills. Thats why Oda made Roger and Shanks have CoC-emphasized powers much more than them being swordmen. And thats also why Shanks aimed for One Piece, for Luffy to surpass directly in a battle, instead of Zoro. Since Shanks' full power is as a stronger haki user, not as a swordsman. Just like how Kaidou is the strongest with his Susanoo and CoC, not his powers as a club/kanabo user.
Thats just my view since 597:
- haki as its own fighting power / style whatever, that is able to strengthen a brawler or a swordman, but not under swordsmanship or brawling strength.
- WSS is sure to have strong haki but the strongest haki user with a sword is not always WSS. They are just two different variable. Just like how WSM is not suddenly a WSS if he pick up a sword.