1- Zoro never had a clash of CoC with anyone so this scene of all over the panel didn't happen to him.
2- What Shanks did to Kid is nothing like this clash you are showing me here. What he did is release black lighting around his attack which should imply AdvCoC just exactly like Zoro's attack.
3- Sure if his AdvCoC touched King its fine because they dont need to be untouched to apply AdvCoC here.
Rangaraku is the attack that revealed to Luffy that AdvCoC is possible. Thunder Bagua is the same. And guess what? Kaido have beaten Luffy thanks to CP0 with an AdvCoC attack too. Luffy's bajarang gun touched Kaido too.. Luffy have touched Kaido multiple times using AdvCoC too and so did Kaido. Shanks sent a flying slash or air bar if you will with AdvCoC along with it.
So no sorry you can touch them with AdvCoC.
here is 2 images for reference :-
1- the 1st AdvCoC attack Zoro used against King after coating his swords with black lighting. See in this image the black lighting has spread outside of the dome
2- Dragon Damnation when the attack got King look around the dragon itself you see sparks of black lighting around just like Shanks's attack on Kid and Zoro was falling and the attack hit King. Which is unclear if he touched him himself or sent it as a flying slash doesn't matter anyways since there is no need to touch or untouch.