User blog comment:Staw-Hat Luffy/Why Kaido?/@comment-4374114-20130204184553/@comment-4605926-20130205162947

Law decided for some reason to betray Doflamingo (which I don't remember being stated in the manga). Therefore, in order for Law to be able to hurt Doflamingo he is trying to ruin his relationship with Kaido. Now that I think of it, this starts to seem more and more like pure speculation, oh well. Decreasing his battle power doesn't seem to have much to do with it though. Well then, I guess we'll just have to wait and see.