User blog comment:Staw-Hat Luffy/About Kaido/@comment-1859380-20130130182807

I kind of have the hunch that Law told Doflamingo to resign and be a regular pirate again, because he either wants to cripple Kaido's arsenal and forces(because Doflamingo is already proven to be a formidable foe) or Law wants to negotiate Doflamingo into the alliance to take down Kaido.

I could see both Luffy and Law taking on Doflamingo and coming out victorious despite the wounds they accumulate from it. With that it would cripple Kaido's forces even though there's still possibly some foes we haven't seen yet.

Just my observation.