How do you fail so easily at something so simple?
Enma demands from Zoro more than it ever demanded from Oden because Zoro's ambitions are far above Oden's.
Thus, CoA control over Enma which worked perfectly on rooftop is no longer working vs King while CoA was always enough for Oden.
You cannot compare anyone's ambition with Zoro's and thus a overflowing haki state like King of Hell exists only for Zoro and it isnt for Enma alone, it is for all of his swords.
Oden couldnt release as much as Zoro does, we literally saw his strongest attack and it never had any fumes nor KOH naming.
There is no proof that Zoro used aCoC whatsoever. Until someone presents it, it is nothing but headcanon.
Yes, Oden's feat has narrative wank, Zoro's doesnt. Nothing new here, we saw it too many times with Luffy already.
Doesnt change the fact that both achieved the same thing with their strongest attacks - just a scar. And Zoro's feat is far more impressive.
He cant cry about Zoro's scar when he already went through that experience with Oden's scar nor can he look for a swordsman like Zoro if he is dead, lol.
Based on Oden having no clue about aCoC for decades and based on lack of haki fumes and based on lack of KOH naming.
Nobody in the world has a better haki portrayal than Zoro when he is in KOH state and it is not even close.
Judging by Asura, KOH too will remain a Zoro unique thing.