User blog comment:Staw-Hat Luffy/Why Kaido?/@comment-4754162-20130206014519

I am of the opinion that Kaido was choosen because there is a flaw in his army that Law is trying to take advantage of.

While its not entirely sure yet but I'm taking a guess that SAD is required to sustain the strength of his artificial zoan army. With the supply of SAD interupted, his army will be greatly weakened, this is the flaw that Law is trying to exploit.

However, what really puzzles me was that during FI arc its obvious that BM should be the next focus (i.e. Luffy pissing her off, her party is coming to due soon) but then at the next (PH) arc the direction seems to take a 180° turn with the spotlight now at Kaido (i.e. alliance pissing off Doflamingo who has Kaido as best customer, destroying the SAD supply at PH and Dressrosa). Its as if Oda suddenly changed his mind at the snap of finger, thus making abrupt direction turn at the whole manga story....