Wrote this same theory in the episode ‘Welcome to Storybrooke” thread.
Theory I have but I hope it doesn’t happen ( This theory could definitely be the game-changer between Rum and Neal, but also with everybody in the show )
The curse is the ”Empty-Hearted” ( mentioned in one of the sneak peeks for the episode “Welcome to Storybrooke” )
Needs the heart of the person they hate most.
Ok. This is my crazy theory but I really hope this doesn’t happen: Rum uses the “Empty-Hearted curse on Henry, takes away Henry’s heart to make Baelfire love him. Maybe Rumpel grows to hate Henry and in the 2-part finale this is what he does with Henry. This would definitely change Rum and Neal’s relationship forever.
Personally I hope this doesn’t happen, but you never know with these writers.