User blog comment:LordLuminous/Theory: The Dragons will die in the Tartarus Arc/@comment-5593752-20141007092039

I don't know likes, I think Mard meant that with all wizards powerless there would be no-one to stop them taking the dragon's life-force, I could be wrong though of course. Also Mard doesn't say it 'will' steal it he says he 'expects' so nothing is set in stone.

But on top of that I really can't see Mashima just bringing back Igneel (not even Metalicana and Grandine yet) just to kill them off almost straight after.