That’s not the case. He would have made his blade black but he died. Are you seriously saying zoro will be above all top tiers?
Oden tamed enma at 6 bro. Black blade doesn’t have to do with power scaling like you want it to
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Oden tamed enma at 6 bro. Black blade doesn’t have to do with power scaling like you want it to
We can just say we know he had them by age 9.
But even then there's nothing showing that he had fully tamed the swords at that age.
The scene shows him using swords but without blackened haki.
Back then he might have only tamed it to a low level where he can use it without it drawing haki when he doesn't want to. Zoro had tamed it to that level not long into his training.
At age 15 when he is fighting all of the samurai he's still not using a black blade.
The swords are not black in that scene. Look at the blade in his left hand.
The first time and youngest age we see Oden use a black blade was at age 18. It doesn't mean he couldn't have used haki before, it just means Oden did not show him using haki before that time.