User blog comment:Bahamut.Egg/Dressrosa Arc theories/@comment-3075024-20140327162835

A. Usopp has Conqueror's Haki and Ace was Luffy's Imaginary Brother

B. Much possible, .. country such as Dressrosa with such old history might have some "history stones" that would briefly-explain the void history. If SHs find one by the end of the this arc, it would foreshadow one of the major arc that will conclude this series. Thats what I THINK would happen ( >_>)