I do think you’re right about someone or something from Oz showing up.Really,I could never come up with something so logical–and with hints in the show too!!! 
Awesome!!!!!! I’ve also heard that maybe Rumple’s father was the cowardly Lion.If that’s true….. that might have been how he found out bout the slippers?
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Keeper of King George's Coat of arms;Tiny's pickaxe;Belle's bronze vase;Emma Hacker device and true love kiss to Henry;Granny's surcharge on pickles;Snow's "Good will always win;Regina's apple turnover;Gold's pink shirt,Mickey phone,&glasses(1x12);RQ's chess set,and Chip's shattered remains