Joyboy’s real name is Davy D. Jones.
Teach is Joyboy’s living descendant, just as Xebec was.
Luffy has inherited Joyboy’s will, just as Roger has.

Imu will be defeated by both Teach and Luffy, two separate people who embody the same person that Imu wiped out all those centuries ago.

Both Luffy and Teach will settle their score in one final battle over what truly triumphs over the other; blood lineage, or inherited will.