You are adding the word “eventually” to this scenario that doesn’t exist
I’ve been discussing this for 10 years now. I’ve been through the semantics of language here like 100 times now
there is no indication that Zoro has failed to do what Mihawk wanted him to do.
back in 2014 when this was being discussed the assumption was that we readers are missing a scene from this flashback.
As in people were wondering why this scene exists where Mihawk tells Zoro to turn his blade black and it’s just CoA yet Zoro doesn’t have black blades. What we thought at the time is that we are going to get another scene following this Mihawk scene that actually explains that CoA isn’t what Mihawk meant and that there’s some specific thing Mihawk told Zoro offscreen
this was the assumption for years after this scene, and then Oda in Wano said there is no further explanation
Here Oda reveals that Zoro HAS NO FUCKING IDEA how to “FORGE” black blades. He literally doesn’t even understand why the word “FORGE” is being used in relation to making black blades
So actually Mihawk didn’t tell him a single thing about making an actual Black blade since clearly Several years after that scene, Oda reveals that Zoro has no idea how they are FORGED