All the panels which lacks lightening doesn't even have Haki coating in his hands lmao.
You're arbitrarily making up rules again lol.
"Yeah, there weren't lightning effects cuz there was no hardening!"
"Lightning was added when Luffy used hardening"
What even is this silly thing? You're completely childish.
The simplest explanation is usually the best one when choosing between multiple theories.
Too bad all your "theories" are complete nonsense.
Kuzan and Garp are not conqueror confirmed at that point of time.
Garp's Impact attack before he fought Kuzan:
Okay, Kuzan didn't show it before but Garp demonstrated the exact same ACoC visuals AND we've seen later how Kuzan matched Garp's other Impact move with the same visuals, here again:
Also, BOTH used hardening as well.
Luffy has already shown it, the rule suggest given the setting whether Luffy had shown it or not before attack landed, it was conqueror because he is already a confirned user of conqueror and conqueror coating lmao.
Idk what you even mean with this part but this was Luffy's first attack on Imu:
Look up at the top corner of this panel.
There is no "black lightning charge" yet it's an ACoC attack. Pretty obvious.
Like I said, if it's about giving the "benefit of the doubt" to a confirmed (A)CoC user like Luffy whether this attack was coated in CoC or not, you have to apply the same standards for Garp as well because he is also a confirmed (A)CoC user.
Name me one Conqueror user who hasn't shown lightening before the attack, that's the most badic criteria lmao.