Heart Over Blade
Kizaru is being saved for late game so he might have a very deadly awakening and skill set A weak and tired kaido beating kizaru who could be the second strongest in the C3 dosent add up. kaido was gassed out thats why he was truly done after barjang gun. he would not have enough gas in the tank to put down kizaru if he was weak and tired
Kaidou wasn't just gassed out. He was knocked out, with his horn broken and possibly other broken bones. Like I said "weakened and tired" Kaidou still retains his AP so Kizaru won't be able to match Kaidou's ultimate even in that state. Even Luffy with G5 durability and yonkou level aCoC seemed like he would've been one shotted if he took Kaidou's ultimate head on. Let alone Kizaru who has neither.
Also there's a difference between being saved for late game as a subordinate and being saved as the main villain of an arc. If Kizaru fights Luffy now, he is only 1 arc removed from Kaidou who always scaled higher than him due to his portrayal.
Kizaru will more than likely still be around in the final war, as a mid level boss for one of Luffy's subordinates or allies. In fact Luffy's right hand as WSS would beat Kizaru with room to spare in the final war.