I think more than when (It'll be against Mihawk imo) an interesting question is which will he forge first?
Enma, the strongest, Wado Ichimonji, the one of the promise, or Sandai Kitetsu?
I think wado ichimonji is the most likely, but Sandai Kitetsu is very shōnen answer and Oda might surprise us.
It's basically a cursed sword that invested in Zoro stocks early on in the series (we know swords and especially cursed swords have will or residual of will).
Or maybe both. The one I see as least likely is Enma. I expect by the end of the series he will have 3 black blades and the undisputed WSS from any era.
Enma, the strongest, Wado Ichimonji, the one of the promise, or Sandai Kitetsu?
I think wado ichimonji is the most likely, but Sandai Kitetsu is very shōnen answer and Oda might surprise us.
It's basically a cursed sword that invested in Zoro stocks early on in the series (we know swords and especially cursed swords have will or residual of will).
Or maybe both. The one I see as least likely is Enma. I expect by the end of the series he will have 3 black blades and the undisputed WSS from any era.