So I noticed something this chapter when Law asked if doflamingo was a celestial dragon doflamingo said a little deeper than that. This reminded me of back when he was finishing off moria and moria asked who sent you... Sengoku he said nope higher than that. So this makes me think that Doflamingo might have connections with one of the gorosei but how. Here are a couple idea's
1. He is related with one of them
OR!!!!!
2. He has a deal with them
Tell me what you think