Yes. That doesn't mean its a powerup lol. He learnt Homurasaki from Kinemon while he improvised with Rokudo no Tsuji by himself.
Yes, him turning Enma black has been forshadowed in the Manga already.
We were literally shown him trying out and training his haki bro. He cut off a cliff. By that logic, Luffy training his Ryou/Internal destruction was offscreened. Doesn't take anything away from it being a powerup.
The very reason why we got a lot of explanations regarding how Enma works and how it draws haki out is because it would eventually lead to a better haki control/efficient usage for Zoro. Else Oda could've just went "Hey guys, here's a stronger sword!". Guess what? He didn't. That alone shows what Zoro's powerup truly is in this arc..
You don't get hit. Here they mentionned Zoro's PU in relation with Wa No.
Therefore if both weren't PU why are they quoted ?
You cope to hard.
Foxfire style is a PU
VC won't mention every's Zoro's attacks
It's not a foreshadow of Zoro's turning black who is mentionned but Enma's effect.
When it take Zoro's CoA it litterally becomes black.
Luffy unlocking and training his ryuo was showed several times. For Zoro it was share with black blades convo.
You can deny as much as you want Enma and Foxfire style were more highlighted every were Manga or VC really weird for things who aren't PU isn't it ?
You just cope to hard