Lots of pieces that we have no idea where they go yet!
I definitely think Sarah’s back to film something. You may be on to something about lost souls going to Oz. Maybe the Witch followed MAP back from OZ to the EF and bided her time to take over? So they sort of encountered her, and then people took refuge somewhere or will need to take refuge in the Dark Castle.
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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