Ass, he had one lucky hit on Luffy, same Luffy was joking around, even Ulti got one hit like that, with make Luffy finally go serious, meaning he was not serious against Apoo.
Cracker was a whole fight with Luffy using all his arsenal with G2/G3/G4 and didn´t still beat him, only after Nami and the homies help him out. What did Luffy used against Apoo again? Nothing, it wasn´t even a battle, Apoo hitting him from far away and that is it.
Then tell me how Luffy who clash equal with Doffy jump tiers only to clash with Kaido equal, same Kaido who would destroy Doffy?
Explain your powerscale her then, if you know it better, then go and explain if Luffy didn´t really jump tiers, how he can fight Kaido equal, same Kaido who would curbstomp Doffy?