Thing is Oda has done very underwhelming job of building tension between Luffy and Kaido.
With Zoro we have lore of Wano, Hiyori, him waiting for a samurai as monstrous as Oden, Kaido wanting death at the hand of a samurai etc.
Plus it feels very awkward a brawler fighting a fucking dragon in a land of samurai. Japanese mythology is full of swordsmen defeating Dragons. Idk how is Oda even gonna draw that fight and not make it look dreadful?