Nah Kaido can dodge bajrang gun if he wants to ; not sure about g5 limits but yeah
Kaido has acknowledged "barely standing" pre-G5 Luffy can give him a serious fight unlike anything he's had in years.
Now he has internally acknowledged that Luffy has surpassed him as Joyboy.
Luffy does not slide back in serious strength, he is only getting stronger from here, even after he wakes up post this fight he will have gained strength through narrative haki bloom.