Just a thought, but what if PP didn’t “let” Wendy go. What if he already brainwashed her as an agent and it was all an act, so she acted frightened, and Bae volunteered to go. You have to go willingly, and there was no other way he would go. Then when it returned, it took her brothers and her back.
Glasses does make sense for a codename for a grown up darling brother, but not sure of keychain. Guess they could just make up a random word too once in awhile :P.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass