I think it sounds very plausible. The one part I am not sure about is Greg. Is Greg’s goal larger than finding his father and maybe revenge against Regina? How much collateral damage is he willing to cause? I think Tamara is willing to go pretty far.
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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