Shiryu will probably not even be zoro's next fight, why Oda would give him acoc if it's not to fight acoc users?
Gimmick fight.
Oda will flex his brain cells to showcase Zoro's growth in CoO department.
Once Shitryu got Invisibility fruit I knew that is set in stone.
It won't be super mega swordsmen matchup as everyone thinks, it will be fucking hide'n'seek.
Shitryu: You sure are strong but can you do this!
Zoro: OH NO WHERE HE WENT I NEED TO SHARPEN MY SENSES AND UNLOCK BETTER OBSERVATION HAKI!
Shitryu: OH NO U FOUND ME.
Zoro: UGA BUGA SANZEN SEKAI!.
End.