I had the same thought. Maybe the monkey is the voice Rumple is hearing? Maybe some Monkeys are fighting for freedom, some are enslaved, and this one is trying to communicate. I too hope it is not Neal, because that is scary!
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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