At the end of the day mihawk himself isn’t important his title is
If someone takes it from him before zoro all zoro would need to do is beat the next guy. There’s also the fact unknown characters and fighters to the general public are not going to be considered. So all zoro has to do is fight the true strongest swordsman to prove himself
Hell a better mihawk with even more potential was created with s-hawk
Mihawk at this point in time is just a temporary title holder. A title that can easily become irrelevant with even stronger characters
When Luffy is fighting Blackbeard or imu zoro is either fighting shiryu or holy knight
Mihawk makes the wss title look meaningless. Zoro’s going to actually give the title true weight and meaning