@Shiroyru Read this dialogue
Zoro had fought a Dragon (Kaido) and Dinosaur (King) with forte being durability and King says following
Zoro: So in the end, for both Dragons and you Dinosaurs...
Zoro: ...is durability your forte!!?
King: !!!
King: That's correct...but it's even more so in my case!!
So even King says he's more durable than the dragon that Zoro fought Kaido.
But of course he is because
King's wings ARE more durable than Kaido's scales, there is no getting around it.
And Luffy needs Advanced Conqueror's Haki to only do tatsumaki level damage to Kaido, so he seriously can't do any damage to king