I’m thinking Pan sent the seer to Rumple, knowing he would steal the ability for himself, thus setting into motion everything. Pan probably did that thing to her eyes, too.
Also, I’m pretty sure Pan has ties to the Blue Fairy. If he was telling the truth about needing to save magic with Henry’s heart, then BF is still good, but also still sneaky. I wonder if Peter Pan is like the half-fairy son of Blue Fairy. It would explain some of her coldness in a way if she was burned by a rebellious act when she was younger, resulting in a pregnancy.
Blue Fairy’s power of belief definitely seems to link to Neverland, which Tamara said was the “mother load of magic.”