I think Kaido just has normal attack speed (like pretty much everyone else), it's probably why BM can go at it with him in close quarter combat aswell.
It's just that Thunder Bagua is fast as fuck.
Similiar to how Kizaru is only moving at "lightspeed" in his logia Form aswell.
Or how Zoro is also very fast within those sprint moves. Boundman for example also only has that speedblitz speed if he uses its own version of Soru.
Overall Kaido's still a very big target. So he would naturally be at a disadvantage if you can block his stuff, which Luffy is finally able to do.
That's why I can see a big comeback for G2 Luffy happening. He casually has that speedblitz-speed on mid range. If that is what base Luffy already can do, just imagine what G2 + CoC can do.
Imo G2 currently is the most underrated ability of his.