Does look like it–when it’s come up before, most thought it would go to Gold’s shop, so Belle might use it, but now that we know its in the Dark Castle, it seems like it has to come into play!
I also wondered before about this, as the crystal ball is an Oz reference, and there’s an awful lot of green in Neal’s apartment. Now that we know he is NOT PP….what if he also has a connection to Oz or is about to have a connection to Oz? Oz of course having the famous Emerald City. The portal’s are green too, of course, maybe that’s all the production team was thinking by going so heavy on the green. It just was so much I don’t think it was entirely random.
“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