A lot of people need to wait until we see actual fighting from Kaido/Luffy on screen for more than 3 pages.
This was exactly what happened with King for quite a few chapters were even fans of King now were shitting on him while Marco held back him and Queen. Then we got 1023, 1027, 1032, 1033, and 1035, and all of those showcased King in a much different way that didn't drag out his potential generically (seriously, all he did was kick Sanji transform, shoot at Marco, cut his wing, and that was really it up until the time when Zoro attacked him).
Same goes for Kaido and BM now. They've been dragged out as being these huge, tanky monsters, but Oda hasn't actually given them the time of day to truly show us their powers.
The next 5, 10, or 20 chapters, it's finally happening. There's 100% more to both Yonko, especially if there was way more to Queen and King once Luffy's crew fought them.