The main problem behind the yonko vs Admiral Is Shanks.
People assumed that Shanks was the weakest yonko or in the same level of them, and since Shanks has an amazing portray against Admirals people thought they could not fight on yonko level.
The Truth Is, and I Always knew It, that Shanks Is something else entirely, waiting on purpose for G5 Luffy.
The Truth Is, Shanks Is on a League on his own, the mistake was thinking that Kaido was above him or something.
I still believe in Shanks feats showed in Red and what he did against Aramaki because Shanks Is his own thing, of course Oda made the guy from chapter 1 the strongest out of his group, It was not a coincidence that Oda made Luffy leave Shanks as the last one out of the original ones, the new Yonkos Luffy, Teach and Shanks are gonna play a League above Big Mom and Kaido, not only them but also the likes of Dragon, Kuzan and Akainu since thks Is a shonen, of course the top tiers left alive that Oda preserved are above Kaido and Big Mom who are already dead in the "Yonko Saga" that started in Punk Hazard and finished in wano, while the other characters are alive for a reason in this "Final Saga".
And Yes, Kizaru Is slightly above Kaido.