If you wanna do the boxing match shit then alright.
Let's say they were in the ring. A huge ring. Like the Dark Tournament ring from YYH.
Is there any reason, any reason at all, for Luffy to not use ACoA and ACoC from the jump?
It's not taxing. It massively boosts his power. It's a net positive.
Yet in the real fight, he never used ACoC until the very end, and didn't use ACoA in G5 though he used it in Snakeman.
It is painfully obvious that Oda purposefully stopped him from using those purely to make it easier for Kizaru to survive and to drag out the fight, because nobody wanted to see him just get one shot and beat up, this isn't a Luffy vs Blueno kind of fight.