Because he and kid failed to push kaido to a hybrid, they probably lost to dragon kaido or base kaido in their confrontation in the past.
And they just studied the weaknesses and strengths of DRAGON kaido according to killer and kaido, so kaido going totally into a form not seen now, his amazement makes sense.
And they just studied the weaknesses and strengths of DRAGON kaido according to killer and kaido, so kaido going totally into a form not seen now, his amazement makes sense.
Post automatically merged:
Zoro fulfilling Oden's will is insignificant to Luffy becoming PK. One of Luffy's requirement of becoming PK = surpassing Kaidou. So yeah going by that narrative, Luffy will be new WSC to replace Kaidou, before playing ping-pong with BB over WSC-WSM status.
Luffy also punched him with Gear 3rd gatling in wano and made kaido out for some time or when he used gear 3rd and punched him above his head
all those punches did nothing kaido stood up like it's the time to see luffy again but alas he found him lying on the grou... no he gor helped by zoro again 

If not for saving luffy zoro would be absolutelly useless, its hes role now becouse hes too weak