Zoro satisfied Enma with COA alone too.
What you are ignoring is - the sword can see into you and test you.
The test of Oden and Zoro are not the same because the things that are inside them, that Enma sees, are not the same.
One if a far bigger monster than the other and his test is far harder. You should guess who.
>Zoro lacking in CoA... Brah, the guy lacking in CoA matched Oden's feat without need CoC, lol...
Seems like you still didn't wrap your head around that Zoro is THE special individual when it comes to Power...