Now I don't know how Oda is introducing something like this lmaooo
It's not really that crazy
Oda has introduced the concept of Zoan Devil Fruits having a will of their own / soul
and also swords having auras / wills
and we also know Souls exist in One Piece beucase of Brook too
all he needs now is to introduce a way for a Soul to enter another person
That could've been Xebec's DF for all we know and his soul resides in Blackbeard right now