i think the reason he did is the speed of the other gears is lacking
coc wouldnt change that
I think there needed to be some key moments when we could see that Kizaru started to "struggle" at first with the other gears, then went more easily and dunked on these.
That's some battle pattern I'd gladly see tbh.
As for the ACoC stuff. I do think it makes a difference.
They are harder to block - very important since Kizaru effortlessly blocked Snake Man hits which would maybe look different if they were amped with ACoC.
ACoC attacks simply hit much more harder.
Besides, this is still just the beginning of the fight. Maybe both will start using ACoC at some point of the battle.
At the end, it isn't even that bad. I mean some people cope about "If Luffy used ACoC he would trash Kizaru" but we've already seen Kuzan tanking ACoC hits from Garp. So I doubt Luffy using ACoC would immediately trash Kizaru. That's just unrealistic and stupid expectations driven by agendas.
It is also not likely Kizaru wins against Luffy lmao. People also didn't learn from Luffy vs Katakuri. At best both get fully interrupted which would be beyond trash. Who wants to see Luffy vs Kizaru rematch being postponed?