Don’t forget August knows where Neal lives too. We don’t know how the reversal of the curse affected him. If he ended up as a young boy in EF, he may have his memories back. Or the theory that it was August in the cab watching Emma & Walsh and the possibility of him knowing Walsh could come into play.
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Nothing is impossible on OUAT. Everything has a way of repeating itself. Keeper of the Keeper tread: https://oncepodcast.com/forums/topic/official-keeper-thread-3/#post-217924