So in chapter 690, Law mentions that the war 2 years sgo at Marineford was just a prelude. As me know Doflamingo is supplying some with SAD to build an army of what appears to a mass amount of Zoans; awakened or not, that seems badass. Back during Marinefold, Doflamingo was given an order from higher up to stripped Moria's Shichibukai title. So a theory i was thinking aboout is that Doflamingo is providing the DFs to the Navy so they can take one a yonko with no problem. It's just a idea i thought about randomly. Thoughts?