The "Strongest Swordsman" is such a fraud title in the world of OP.
It just means whoever is the strongest fighter that HAPPENS to use a bladed weapon akin to a sword.
Mihawk "The Strongest Swordsman" would have to give up his title if White beard used a sword instead of a polearm

If Teach decided to use a sword I guess he would be a stronger swordsman than Mihawk
If Kaido used a sword he would have another title under his belt
If BM- well she already does AND is stronger than Mihawk lol
Then there are the admirals who also use swords. And Nasjuro now.
All above could claim Mihawk’s title if they really wanted to. Oh and Shanks Dad would kick Mihawks ass too now.

Zoro’s dream is beating a guy who is not even top 20 in the verse.