Orochi is the one who snatched the land from from Kozuki clan = Nothing to do with Zoro
Orochi's actions lead to downfall of Kozuki = Nothing to do with Zoro
Death of Oden = Yup, and that same Oden considered Kaido the big threat and main problem
Killed Yasu = Yup, and that same Yasu considered Kaido the big threat and main problem
Execuetion of last surviving heir of Kozuki = Momo's own issue, not Zoro's.
What you're describing sets Orochi to be defeated by Momonosuke, who will avenge his father and reclaim the throne of the Shogun from Orochi. Which is further cemented by the fact he's inherited the sword that's related to slaying Orochi (will be coming back to this later).
Now you're saying there's more for Orochi vs Zoro than Kaido vs Zoro? I don't see how that can be true. And that there's zero build up of a Zoro and Kaido confrontation, even after all that I described in the previous post? Hmm alright let's do it in a list way.
- Inherited Ryuuma's sword who is renowned for slaying a Dragon in the capital of Wano.
- Ended up with Oden's sword which has been correlated to hurting Kaido
^^^ Ended up with swords relating two people who've fought against Dragons.
- Magazine comment of a new legend of an eastern dragon being slain possibly being born
- Trained with the sword that's been correlated directly cutting up Kaido..
- Is focused on when Yasu talks about no one being able to take Kaido's head for 20 years