Zoro is stronger than Rooftop Luffy and Kizaru is weaker than Kaido.
No he isn't.
Why would you think Zoro is anywhere near Luffy's level now?
Luffy was at commander-level at the beggining of Wano, and got one-shot by Kaido. Then Luffy went to fight Kaido one-on-one, while Zoro is now at commander-level.
Which is to say, currently there's an abyss between Luffy and Zoro.
Eh Buggy vs Nami is interesting too since Buggy’s buggy balls could beat G2+ level opponents.
Buggy is still an East Blue level pirate
He went from being weaker than Blueno to beating Kaku in the space of a few hours. That’s like what a ten-fold strength increase. He’s not far off.
First, why is that a 10x increase? We are given their numerical powerlevels, Kaku has 2-3 times Blueno's Douriki.
And why couldn't Zoro defeat Blueno before? Blueno was already having trouble blocking Sanji's kicks with his Tekkai back in the train.
Lastly, Blueno has a tricky Devil Fruit, which cannot be measured numerically. In practice, Blueno was close to Kaku's level because of his hax ability.