OKG is far above Stars Gun bro, and this is kaidou after receiving the attack head on and having his heat breath exploded in his own mouth:
After receiving the attack:
Kizaru was already thinking it was bad if the Stars Gun hit him before Luffy even hit him.
While Kaidou was not intimidated even by a punch the size of an island with a spring effect (maximally compressed) and with all the offensive Haki stacked.