Zoro is the monster samurai
Another reason why he will surpass Oden in this arc:
Everytime someone claimed that his sword fighting style was the best or bragged about his sword figthing style, Zoro happened to prove them that Santoryu is better
So Oden Nitoryu is the next, Zoro will...
Pirate King Luffy...What's wrong with that? It's canon, or better, is bound to become canon soon or later
Grandmaster...I don't understand where it came from in the first place
Wanji...it just doesn't fit, Sanji is mostly an L collector rather than W