Zoro will injure kaido imo, but he will not help in main battle against Kaido.
Meaning, think of Zoro cutting kaido as him facing Enel before Luffy takes on Enel in Skypea.
Zoro will get stomped. BUT Zoro will manage to land an injury on kaido. BUT not an effective one, meaning it will not play a factor in the grand scheme of things where that injury affects Kaido in his battle with Luffy LOL. It will be an injury just to give hype moment for Zoro, but overall, it will be NOTHING
Cause if you guys think that one injury will be the reason for Kaido's stamina to fall against Luffy, then he is not worthy of being a Yonko to begin with. Look at how many bullets, sowrd, spear, cannon, and magma fists WB took and was still fucking shit up and took out Akainu for some time. If one minor cut from Zoro will be what makes kaido falter against Luffy, I would laugh so hard at the writing.
Anyway, I do believe Zoro is destined to use Enma to land a hit on Kaido this arc