Made the same point to @comrade. There's no way to cope around this. Their special durability is active all the time. Haki, consciousness, nothing matters. That's the reason Kaido survived all those execution methods but Akainu's element especially did the trick lol.
1) I'm still sure there is a difference between Hybrid Kaido taking Magma punches head on or having his unconscious base self sleeping in magma for days and disintegrating at a speed not actually known to us. Just like Oden resided in boiling oil for an hour. Eventually, he would've disintegrated too.
2) Kaido isn't just standing there eating blows. He is fast, can block with both weapon and barrier Haki and has enormous attack power. Even awakened Luffy, who has extreme resilience towards blunt force, was taking heavy damage to the head from Kaido's Bagua variants.
This really feels like the usual Akainu hate filled bias post I'm used to from Tejas or that L5 whatever weirdo. You're better than that lol.
Old Rayleigh was respectful to Akainu's subordinate while he treated the supposedly EoS villain BB like his bottom bitch
Further proof that Kaido only existed because the WG allowed them too. The Yonko are on payroll. Has been obvious with Shanks and now with BM and Kaido.
Hence I say chill with the Imu hype. Obviously, Imu is incredibly powerful if he is Uranus himself, but there are limitations to his powers. He cannot just subjugate the entire world. Hence the world is largely controlled by pirates, hence the Gorosei themselves say that they cannot conquer Wano.