Luffy was going to lose the gear 4th so he used a second over kong gun, Kaidou says hourai and goes to attack him but the cp0 intervenes using tekkai(we don't know if cp0 used tekkai as an attack against luffy or used it to defend against Luffy's attack, someone asked the leaker in 5ch so maybe we will get the answer soon).
So Luffy was losing, don´t matter if he got distract or not, I doubt that second Over Kong Gun would finish him.
In fact Luffy will awake his df and even hurt Kaido later more, also if Kaido really has awakening, he is far from getting finished.
Sound like this event happen to give Kaido character more development.
Kaido would win that clash, with or without the CP0 guy.
Happy to at least know this.