Either you have no idea what you're talking about or you're denying facts.
Kaido didn't place Luffy on their level. He didn't compare Luffy's attack power to their power. He didn't say Luffy's growth reached a level nobody else reached in Wano. He was just surprised by Luffy's growth rate.
Here's the scene that supports my post.
Kaido ask himself what happened to Luffy after he beat him and wonders if Luffy could reach their level. He doesn't put Luffy on that level. Nor does he compared Luffy's level to their level.
Kaido recognized Zoro's strength by acknowledging Zoro's power to scar him which was separate from his CoC. Yes, he didn't compare Zoro's strength to Oden's strength. Just like he didn't compare Luffy's strength to any top tier strength. Just wonder if Luffy could reach level thanks to his quick growth. No wonder Oda kept Zoro away from Kaido post RT. He didn't want Zoro to embarrass Luffy.
Hakai wasn't 2 times a Yonko attack. That's headcannon you and the other haters push to try to downplay Zoro's strength. It was beyond that. Hakai is a combination attack formed by 2 Yonko performing the technique in perfect sync with full strength. It's one of the strongest attacks in the entire manga and required more power than Kaido and Big Mom used up to that time. That's the reason Oda had Kaido ask Big Mom if she still had the power needed to perform hakai even though we saw her use elbaf spear several times and had the power to slip the sky while clashing with Kaido.
It's funny how some try so hard to make Zoro dealing with hakai a bad thing for him while the captains couldn't do anything about it other than run scared, rely on Zoro's protection and thank him for it. That shows us they wouldn't have been able to handle the attack as well as Zoro, if at all.