I could see that. It could lead to the group splitting if the cure is based on items in different locations. I could see Regina saying, Rumple had the right idea, bye fools I am going after Henry. Then maybe that is why she is wandering alone, meanwhile Hook leads them to TB, because the cure might have something to do with her. In the play TB drinks the poison for PP, so maybe this is their spin on it.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass