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Law, while taking his leave from the SAD room, blatantly said, "Pirate Vergo".

I think there's more to this than meets the eye.

Plus just a few panels earlier, Vergo said "You don't know Joker's past".

So, "Joker's past" + "Pirate Vergo" = Vergo used to be a pirate until Doflamingo pulled his strings (coincidentally is his DF power?! xD) in the WG / Marines to put him into the marine ranks.

Blast from past : Who was it that was specifically choosen by direct instruction from WG / higher marine ranks to kill a certain incompetent Shichibukai? Its Doflamingo... coincidentally?

Let me know your thoughts.