Actually not, Dragon is Xebec son, so Luffy is Xebec 2.0 and like Xebec his crew must have all evil forces: BM, Kaido, Shikky, WB.
For now it's Yamato - Kaido, BM - Nami(she actually have part of BM power), Sanji is Shikky?! Zoro - WB?
So that was predicteble from the begining. Problem is just Yamato personality