I have had a theory since 2×21 that the Shadow controls Peter Pan rather than the other way around. Also, the Shadow demonstrably does NOT belong to PP, since if you look closely, PP has his shadow! Also, I think PP might be cursed in a way similar to how Rumple is cursed. Hook called both Rumple and PP demons. What if the Shadow is the real demon?
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy