I know he will most likely be the strongest swordsman ever. It doesn’t mean Mihawk is the strongest ever. No top 1 character in history is having the portrayal Mihawk did before they go all out. Seriously can you imagine Madara or someone shitting the bed the way Mihawk did in MF? Ask yourself if Marco is sending Vista alone to stop xebec lol. Zoro’s PL catapulted when he unlocked ACoC and against Mihawk he will unlock an even bigger power up. If he goes in the fight as an equal or someone close to him then it won’t be surprising he will come out of the fight 1-2 tiers stronger. Nor will it be surprising if he has to fight someone else like Imu or Shiryu after it which can catapult him even higher
I do, however, think that Mihawk is top 1 alive now that Kaido's "dead", but that the new gen will surpass him once they start ascending to that next level. Starting with Blackbeard and Luffy then later the likes of Zoro and Sabo etc...