Zoro vs Kaido (if he returns) is a fight similar to Zoro vs Ryuma.
Why? Because Zoros AP is already extremely high without full mastery and Kaidos AP being enough to break Zoros bones in 1-2 hits.
Zoro does not have anything close to Luffys Gear 5 durability and he can't restart his own heart. So in a potential scenario of Zoro vs Kaido pt 2 it's more or less who strikes first, same as Zoro vs Ryuma.
Why? Because Zoros AP is already extremely high without full mastery and Kaidos AP being enough to break Zoros bones in 1-2 hits.
Zoro does not have anything close to Luffys Gear 5 durability and he can't restart his own heart. So in a potential scenario of Zoro vs Kaido pt 2 it's more or less who strikes first, same as Zoro vs Ryuma.
20 to 30 broken bones Zoro took a hit from Kaido TB and didn't lose consciousness. Kaido would have a hard time putting him down.