You believe Zoro can't cut an ancient zoan even though he's able to cut Kaido?
All the Scabbards, who are weaker than Zoro, could cut Kaido with their weaker attack. King's body is more durable than Kaido's and ancient zoans. The manga explained that.
No, the flames don't increase his durability. It increases his endurance.
All the Scabbards, who are weaker than Zoro, could cut Kaido with their weaker attack. King's body is more durable than Kaido's and ancient zoans. The manga explained that.
No, the flames don't increase his durability. It increases his endurance.
No flame base king has human dueability
No flame hybrid/zoan king has ancient zoan durability
Flame on base king has lunarian durability
Flame on hybrid/zoan king has both durabilities stacked