I agree more with the idea that the blue fairy had an alternate agenda. She seemed a little too eager to get Bae to take his dad to the other world. Maybe she just saw the chance to get rid of the dark one permanantly? I’m sure he has plagued the faeries for longer than the time Rumple spent in that role. She knew exactly who he was. Also, she helped August deceive Gold into thinking he was Bae. So we already know she can play that game.