If as I think black blade can only be done by pourring a big amount of Haki in one go in a blade, I think that Zoro will most likely turn his 3 blades black at the same time.
From a narrative perspective, Enma turning black in Wano makes the most sense to me, so yeah I do think it will happen in Wano.
The people saying that it cannot happen this arc are falling in the same rhetoric of the people who were saying that Zoro cannot get Adv CoC this arc. And we saw how this end up.
Saying that Zoro cannot ended up Wano with a better CoA than most top tiers is like saying that Luffy cannot end up WCi with a better CoO than most top tiers. And we saw how this end up.
From a narrative perspective, Enma turning black in Wano makes the most sense to me, so yeah I do think it will happen in Wano.
The people saying that it cannot happen this arc are falling in the same rhetoric of the people who were saying that Zoro cannot get Adv CoC this arc. And we saw how this end up.
Saying that Zoro cannot ended up Wano with a better CoA than most top tiers is like saying that Luffy cannot end up WCi with a better CoO than most top tiers. And we saw how this end up.