Luffy was in worse condition than Kaido

I’ll just mention that before meeting Kaido, Luffy used 4-gear a couple of times and was knocked out by a duraneg apoo attack.

Luffy completely spent all his haki and was exhausted due to 4 gear in chapter 1003

Luffy in offscreen recovered from the effects of Gear 4

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We must also not forget that Kaido’s attacks on Luffy initially caused much more damage than Luffy’s attacks on Kaido, here you can see that Luffy, defending himself from Kaido’s normal attack, screams in pain, because his haki is much weaker

Kaido knocks out Luffy.

https://preview.redd.it/s6aupy3zfr3c1.png?width=693&format=png&auto=webp&s=61911bb7d1df6ff51d3dae4b347e7ad6335b4e29

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Luffy says that his attacks were not strong enough to cause significant damage to Kaido (here we immediately understand that if Luffy's acoa was not enough, then the scabbard, kidd and killer are just a joke)

Kaido knocks out Luffy 2 times and throws him into the sea, while Luffy gave him a good fight, according to Kaido, he hasn’t tried so hard for a long time.

Kaido says Luffy used acoc badly

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全てを背負って!! ギリギリで立ってる男にキミは!! - “He (Luffy) carries the entire burden on his back and can barely stand on his feet.”

Luffy, after returning to the roof, could barely stand on his feet (the food gave him the opportunity to get up, but did not heal him or remove all the damage).

To me, Luffy clearly looks worse here, because even when he got up, it’s clear that he has difficulty standing on his feet.

By the way, I don’t know why many people don’t mention the fact that Kaido could refresh himself with booze, and plus he became stronger when he was drunk

Kaido's haki was also likely improved in the battle with Luffy

Luffy enters Gear 4 again and says that this is his last Gear 4 (which already shows that Luffy's condition is much worse)

Luffy once again repeats that this is his last 4th gear and that he doesn't have much time left.

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Agent distracts Luffy and he takes a blow straight to the face and dies

Momonosuke confirms that Luffy is dead

Luffy in 5th gear. Momonosuke notices his voice nearly dying out, and Kaido says be careful or you will die.

Throughout the battle, Luffy was exhausted due to his gears, passed out 2 times, died 1 time, even after he ate a lot of food, he could barely stand on his feet and fought with Kaido, who was superior to him in everything and was much more durable and had better endurance. In gear 5, being in worse condition, he received many more hits and still destroyed Kaido in the final clash.

In their rematch, you need to take into account that from the very beginning Kaido will fight with a character of his level and it will be a completely different battle, Kaido will no longer be able to knock out Luffy like that, and in 5th gear Luffy is superior to Kaido - he can restart the heartbeat, thereby restoring some stamina + in 5th gear his endurance and durability are not inferior to kaido, and his ap and hax are far superior to him. Well, as a fact, Kaido has nothing to answer against Bajrang Gun.

I hope the post was useful to you.