Oden didn't necessarily use advanced conquerors either, as confirmed by his journal saying Roger and WB were another level above him, a level Yamato sees Luffy as being.
It was not confirmed to be advanced in that vague SBS, merely that both attacks used CoC.
In any case Oden created giant scars, Zoro created a small scar over a tattoo, the potency of the CoC is tiers apart, no need for Zoro to have CoC to create such a small scar, Roger with far more CoC than Oden didn't create a scar on Oden.
It was stated with 100% confidence by Kaido immediately after Zoro's attack that there was no way Luffy could possibly have advanced CoC, which makes zero sense if Zoro, Luffy's subordinate had just used adv CoC. <- Answer this point or don't bother responding and I will consider you to be ducking.