You misunderstood what I typed.
Kayn is forced to leave the wall by the ability and the spot is telegraphed to everyone by a colored dot he can't avoid it he can't choose a different spot when the ability forces him. That's when you can reliably land your E on him. If he decides to leaver earlier that's a different matter but he will always leave at that one spot even if he wants to leave earlier but that's not a reliable hit anymore at that point.
You use walls against kayn even close because you can hit him in that wall bro and especially when his walk through the wall ability is on cd.
You literally said: "Kayn's actually pretty easy to counter with Zoe." I'm saying that's is far from easy and that counter is kayn to zoe not the other way around.
Your 10 games say as much as nothing. As I stated several times already on paper kayn beats zoe in a match of equally skilled players kayn beats zoe again.
I beat people with champs that should lose too because they just play worse at these moments but it says nothing about either of the champions or their potential.
That's all I'm saying. If you still think no mobility, squishy, mage is a counter to ad assassin with mobility, slow, knockup, invulnerability then let's leave this conversation. I'm sure that others can take al lthey need from this.