Luffy got adv CoC the right way training, and actually knowing he had CoC and fusing the two concepts of ryuo and CoC together, after experiencing two knockouts from the technique.
Zoro jumps up from no CoC to adv CoC before Luffy due to Enma plot hax, that is bigger plot armor than any of Luffy's power ups lol
The mink medicine taking Zoro back to 100% temporarily from a broken bone disabled state is also more bullshit than Luffy recovering stamina from food.
All I can say is Zoro is one lucky fuck to get Enma.