Elbaf Proves One Piece's Final Villain Is Blackbeard, Not Imu

The Elbaf arc shows Imu leaving Mary Geoise and descending to the surface for the first time.

Imu’s departure leaves Mary Geoise less guarded, creating an opening for other forces.

Blackbeard has prepared plans against the World Government and could seize Mary Geoise while Imu is away.