In relation to several claims of Zoro disobeying to Luffy's orders; let me say two things:
- First of all, what happened was situational. Luffy shouting "I've got this" is merely in that Zoro was off for that moment, he never orders him to stay down or infers to solo Kaido.
- Second, if his captain was endangered, Zoro would factually attempt to save him: