Maybe Blue Fairy was once the Black Fairy….
Exactly. Or she learned from the black fairy. I would have been all for them showing that the blue fairy always had her memories and in Storybrooke and she was part of the reason Pinocchio interfered with Emma and Neal and so forth and caused Henry to be given to Regina. There seemed to be some suggestion of that when they showed adult August go and talk to the Blue Fairy in Storybrooke before the curse broke, but i am not sure what they intended there and if it can be developed properly without Neal.
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