Oda keeps branching out his story, and I hate it.
Blackbeard is special. No, wait, Rocks was special. Oh you wont believe me if I told you it was not Rocks, but Davy Jones who was really really special
From what I understand, both Rocks' ancestors and Joyboy failed to defeat Imu. One side is based on ancestory (Davy > Rocks > BB) and the other is based on Will of D.
Imu, Davy Jones, and Joyboy had same goal, but different intentions. Interestingly, all 3 of them wanted giants to be their ally.
It just means one thing; Loki HYPE.