Why you acting like "your WSC shit" is just some agenda and made up thing. Oda portrays Kaido as the strongest. It makes sense that Kizaru is not near that level, and even he mentions Kaido in his first engagement with Luffy. You can't ignore it.
That's also not his point.
Yes, Kaido is stronger than Kizaru and imo his WSC is legit but people expect Luffy to simply walk over other top tiers like the admirals which is especially nonsense considering that Kizaru is an antagonist in this arc and that's usually not how Oda draws Luffy's battles.
No amount of agenda battles change the narrative of the story.
Also, Luffy didn't even solo Kaido so how does it matter when he ultimately defeated Kaido?