@Salah WG @nik87 the thing is, Mihawk himself said, that Zoro has found a purpose greater than becoming WSS (surpassing Mihawk), which is to help Luffy achieving his goal, which will go beyond simply Pirate King. With Zoro himself also saying on Thriller Bark, that his dream is worth nothing if he can't protect his captain. This implies, that becoming WSS by surpassing Mihawk may be just a stepping stone and that after becoming the WSS, being worthy of accomplishing the greater purpose of aiding Luffy/Nika.
If Zoro first helped Luffy to accomplish everything, Zoro would've fulfilled the "greater" purpose before actually facing Mihawk. On the other hand, if Zoro marched into the final battle/war which will change the world, as WSS already, it would have the intended purpose.
At least, the way the story and Zoro's character goes, it's not 100% clear how Zoro's pursuit for the WSS title will be resolved.
But Luffy also said that He has something He wants to do after finding One Piece
However, We all know that He will simply discover that One Piece Activation & his Secret Dream are One and the Same
So, SHs initially have a Personal Dream & also how They envision themselves after achieving it
But as They progress, They will discover that those aren't just Personal Desires, it's actually what They are Destined to do
And what's needed to be done
So when the time comes for Final Act, the End of the Nightmare
SHs will Discover that They cannot Activate One Piece (Luffy's True Dream which is Responsibility of Everyone as He is their Captain)
Unless They each Accomplish their own Dreams
That means for One Piece to be Activated
Zoro must reach Peak Swordsmanship
Nami must have World Map
Usopp must be Bravest Warrior (Probably lead Elbaf Army)
Sanji must discover All Blue
Chopper must discover All healing Cure
Laboon + Bink Sake Song are needed for it as well
Fishmen & Humans being United is also necessary
Entire History revealed is also needed
Franky's Final Invention is needed
All Nine SHs represent Luffy's Keys to Unlocking One Piece Project
And just like Luffy gonna have a Final Villain standing in the way of his Destined Role
Each SH gonna have an Obstacle that Forces them to achieve these Nine Necessities i just mentioned
Without these Obstacles, those Dreams wouldn't be considered "Impossible"
And without these Obstacles, SHs Crew don't need to be the Crew of Destiny
So yes, Zoro will still have a lot to do after He defeats Mihawk
But this doesn't change the Fact that Mihawk is One of those Ten Impossible Obstacles
(For example, for Chopper's Dream, his Obstacle will probably be a World Ending Disease, and for Nami's Dream, her Obstacle gonna be a World Ending Storm ... etc)
You know what's the reason Luffy's Dream cannot be Fulfilled before his Crew?
It's cuz One Piece Treasure is going to End "Death", however you can't Activate that with People still having a Difficult Life, it means They'd suffer forever, first you must turn the World into Place of Pure Happiness & then you End Death
Sanji will End Hunger
Chopper will End Sickness
Franky will End Transportation Issues
Usopp will End Fear
Zoro will End Weakness (Feeling Weak)
Jinbe will End Racism
Robin will End Ignorance
... etc
And however They gonna achieve these Dreams, They will be put to an Impossible Test, and Mihawk is One of those Tests.
