I think that August is actually Bae. I think someone might have said this before, don’t remember who or when. Bae probably wanted his “old” dad back, and probably search for a way to rid Rumple of his powers/curse. He could have traveled around, in not only FTL, but in SB and maybe other worlds (Wonderland?). Maybe he even got help from Jefferson and his magic hat. Now, if August is grown Bae, then imagine his surprise if he found a way to do that, in SB. The sneak peek showed August pointing Rumple's knife at Gold/Rumple. That could be his way to rid Rumple of his powers/curse, and for Bae to have his dad back.
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