You could argue that but what arguments would you use? Do you have definite proof for him being above any others?
At the time of the fight with Luffy he was only stronger than Moria, and currently he's clearly been buffed but still nothing puts him above Doflamingo, Hancock or Kuma. He's being hard carried by his fans expectations.
King was considerably stronger than Queen, Kuroobi being stronger than Hatchan is questionable even with Zoro's nerf for that fight (Kuroobi had higher rank, because Hatchan was only a last minute employee as we learnt in FI, there's no statement to their strength), and Absalom was nowhere near as strong as zombie Ryuma (again, Absalom had higher rank simply because Ryuma was just a zombie, but he was a weakling. Absalom was also higher ranked than Oars).
The Mr 1 - Mr 2 pattern is there almost every big arc (King - Queen is the literal same pattern), and when it's not a whole tier of difference like in these cases, a point is still explicitly made about Zoro's opponent being stronger (like Kaku, and people keep forgetting douriki didn't even take into account techniques, powers or masteries, just raw base physical strength).
Yes, if Sanji kick's Crocodile's ass in the future that will not somehow elevate Crocodile to Mihawk.