Sadly character growth in One piece is rare but I hope it will happen soon.
Sadly?
You don't understand the concept of a static character. This is by design, "growth" is capitulation for a freak like Luffy.
Luffy was a freak of nature from before meeting Shanks, saying the same words as Roger, leading Shanks to bet on him as being the man Roger was waiting for.
Luffy has indomitable will, Kaido is in his way to become PK, and will be taken down 1vs1, I don't know why you thought the fight would conclude before the executives are fallen, are you legitimately falling for fake hype, or just using this to opportunistically attack Luffy?