In the next round with Kaido, Luffy will be more calm, allowing to properly use FS and dodge Kaido's attacks
Hyogoro also thought Luffy could shield himself from Big Mom's punches with barrier haki, so i expect both these types of haki to play a role
I expect the battle in Onigashima to at the very least go to mid diff if not higher, with Kaido acknowledging his threat lvl this time, but being saved by someone(maybe Marco)
Then Luffy will ultimately win the final round in a 1-on-1 to destroy the 1-on-1 bet around Kaido's hype(maybe after Kaido getting weakened from a tag-team or allies)