User blog comment:AYET/Who will come?/@comment-6122161-20130625153831/@comment-4754162-20130626014339

As of this moment in time, yes because of business purposes (Kaido basically needs Doflamingo for the SAD and arti DFs).

But if later an alternative method exists, Kaido won't give a fk about him anymore.

I think that is how Kaido and Doflamingo's relationship goes.