Kaido fought the scabbards, rooftop supernova, yamato, luffy post conquerors coating, and luffy post awakening and becoming joyboy
Luffy has been pushed to his limits and beyond against kaido
Training his ass off, fighting kaido through multiple rounds, taking just about everything kaido through at him, and pushing his haki and fruit to his limits
Acting like either of them hasn't tried or done enough is just weird
Even if kaido got back up and luffy defeated him again bet people would still act like it wasnt enough