Some say Oda planned to reveal more about Zoro on Wano but he forgot/changed his mind/introduced too much other stuff and had no time left for this.
I don't think so. Oda is saving the Zoro stuff for a good reason.
Shiryu is likely from Wano. He is a skilled swordsman, when he cut down Impeldown guards he uttered a samurai phrase, wiki states he was born on the Grandline (Wano is on the Grandline), and he is an epithet (of the rain) that resembles for example the title of Raizo (of the mist).
So Oda will give us more information on Zoro's family, when Zoro fights Shiryu, or perhaps already when (and if) Shiryu attacks Wano. Shiryu's family will have something to do with Zoro's.
I don't think so. Oda is saving the Zoro stuff for a good reason.
Shiryu is likely from Wano. He is a skilled swordsman, when he cut down Impeldown guards he uttered a samurai phrase, wiki states he was born on the Grandline (Wano is on the Grandline), and he is an epithet (of the rain) that resembles for example the title of Raizo (of the mist).
So Oda will give us more information on Zoro's family, when Zoro fights Shiryu, or perhaps already when (and if) Shiryu attacks Wano. Shiryu's family will have something to do with Zoro's.