Kaido being weakened from all the fights was almost certainly referring to his stamina
Because he was pulling out stronger and stronger attacks and taking the fight more seriously as it went on
Basically in a straight 1v1 he would outlast Luffy but Luffy has the raw strength to bat on his level now
Because he was pulling out stronger and stronger attacks and taking the fight more seriously as it went on
Basically in a straight 1v1 he would outlast Luffy but Luffy has the raw strength to bat on his level now