Here's the part I don't understand: what was Pan's plan all along? To save magic in Neverland? Because that appears to have been foiled. The heart of the truest believer is back Henry's body.

So after he was defeated, was it only *then* he decided to trade places with Henry and keep his youth (or at least his life) by taking over his great grandson's life. In other words, is this now Plan B, or was the whole saving-magic plan an elaborate ruse to manipulate his grand Plan A, to steal Henry's existence?

I would believe that, too, if only because this is the man-boy who sired the master manipulator of the OUAT-verse, Rumplestiltskin.

And maybe Pan knew his time was up when the gigantic time glass ran out, and he needed another way to stay alive.