Introduce it and forget it.
As usual Oda did a horrible job with it. He didn't let Zoro to touch it.
Plus we all know Zoro will never swap a weaker one for a stronger one.
But but unless it called Enma .. Zoro gave away Shuusui something he got from Ryuma himself in order to wank Oden during rooftop. Lameass move from Oda!!!
A swordsmith in wano for what ? oh yeah just a coward. dude could have merged sandai and nidai and make a new sword, another good idea forgotten.
No one will care about Nidai anymore, all hail Sandai. In Zoro's hands, it will be one of the 3 best swords in the world.