If Rumpel has the heart of Cora cognizant than he would have crashed it already.
However, yesterday I thought about another theory. If Rumpel is Coras menthor, than she would have maybe the same ideas to hide something. Rumpel head the potion of love in the belly of the beast in a golden egg.
What when Cora hide her heart in the near of the “Beast” in a brown ball. Rumpel is probably the strongest Magician in all the realms and he would always look after his only memento of his beloved son Baelfire.
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Heros don't get their Happy Ending!