Zoro and Kaido have many parallels brought up by Oda since the battle started. Here are quite a few i noticed
> Zoro and Kaido challenging each other to a dragon twister attack
> SBS volume 98 revealing that if Zoro were to eat a devil fruit, Oda would want him(or rather his sword) to eat Kaido's devil fruit
> Another similarity between Kaido and Zoro's attacks
It's getting interesting