Blackbeard's lineage will be very relevant in One Piece. Being able to eat two devil fruits will be related to that.

This article contains spoilers from One Piece's Elbaf Arc. Shanks and Blackbeard's roles in the final saga revealed. Elbaf ...

Yamato's story is currently ongoing in the cover stories of One Piece, titled Oni Child Yamato's Golden Harvest Surrogate Pilgrimage. Therefore, her capture by the Blackbeard Pirates seems unlikely.