Everything points towards Kaido dodging the attack. Kaido is right in front of Zoro when he was about to attack . It's dumb to even think Zoro can't aim at such a huge target who's like ten meters away from him. BM telling Kaido to dodge the attack along with the fact that Kaido can't be seen atop the skull when Zoro executed the attack makes it pretty clear Kaido dodged it.