Yeah, but even if Rumpel glimpse in the future. He would believe that hiding the heart in Beas ball would be a crazy dream and would not destroy his only thing that he posses from his son to confim that. No one would search in the near of Rumpel to find Coras heart.
Another thing is bothering me. Have somebody a clue, what would happen, when you try to reap out Rumpels heart. I mean the only way to kill him is to stab him with the special knife, but can you also crash his heart?