I don’t think Xebec cared about the Yami or the Nika fruit. Rather, I think he was hunting a Davy Jones mythical zoan.
Davy Jones lives under the sea. He takes ships and treasure to the sea floor.
Just like the burn scar man, who is said to have a DF
This is Teach’s 3rd fruit.
Strongest Logia = Yami Yami no mi
Strongest paramecia = Gura gura no mi
Strongest Zoan = hito hito no mi model: Davy Jones
The combination of all 3 will give him the power to single handedly sink the world, making him the greatest threat the world has known.
Davy Jones lives under the sea. He takes ships and treasure to the sea floor.
Just like the burn scar man, who is said to have a DF
This is Teach’s 3rd fruit.
Strongest Logia = Yami Yami no mi
Strongest paramecia = Gura gura no mi
Strongest Zoan = hito hito no mi model: Davy Jones
The combination of all 3 will give him the power to single handedly sink the world, making him the greatest threat the world has known.