Zoro is stronger than most Yonko commanders, but still needs a final push to beat Mihawk. Oda has teased Zoro's left eye as a potential key to unlocking his full power.

Zoro obtains Enma from Hiyori in chapter #953 in exchange for letting go of Shusui and though it took Zoro quite some time and effort to get Enma under control, the sword may very well be the one ...

For Zoro, fans know the dream is to fight and defeat Dracule Mihawk, the man who stands at the top of all the swordsmen in the world of One Piece, and that certainly is quite an ambitious goal.

Fans know that Zoro aims to become the strongest swordsman in the world, and to do that, he needs to beat Mihawk. Furthermore, Zoro also intends to do all he can to make Luffy the Pirate King.