Man, stay real. Even base Luffy was able to fight with Hybrid Kaido, even base Luffy partly overwhelmed Kaido. When Kaido started to go seriously all out, only then we saw that Luffy ultimately stands no chance, until Joy Boy absolutely played with an all out Kaido. Kaido managed to fight his way back into an equal fight but eventually Gear 5 was just too powerful and destroyed Kaido within minutes.