Lmao Akainu will be defeated in probably a month of in-story time. Luffy would still be a “rookie” by then
- become pirate king
- learned all variation of hakis
- reach Shanks/Roger level haki and not that weak rooftop shit
- master his awakening
- even more massive passive strength gains due to sailing from island to island and haki blooms
- and probably even stronger technique than gear 5
- 2/3 did not have haki to damage Big Mom and they still beat her
- while the other used Kaido as a training tool and Kaido still lost. And that's only with 1 week of haki training and still noob with adv CoC. Imagine if Luffy started out the fight with all his power ups. Kaido would get mid diff'd.