Luffy got knocked down but still conscious. Kaido cries for a bit then spanks CP0 guy to death. Luffy stands up but Kaido strikes him but Kaido's attack got stopped by Sanji. Sanji stalls Kaido for a bit and the other SHs arrives on the roof after evacuated the samurais and we will have SHs vs Kaido aka SHs vs Oars 2.0
Luffy had already two power ups in the same arc(ryou and adv coc). Another one would be too repetitive. If luffy is defeated again here, it would be better Kaido to be taken care of by the marines. Having said that, 1043 is the best candidate for a flashback.