Board Thread:Spoilers!/@comment-27060727-20170106065555/@comment-25375217-20170107181808

I see three ways "finding young Gideon" could go:

1) Both exist at the same time. However, as they're likely snagging newborn Gideon, that just means their quest was pointless because adult evil Gideon is still on the loose and they have no good way to stop him.

2) Adult evil Gideon will completely disintegrate from existence as soon as Rumple and Belle show up with his child self with no repercussions.

3) It will completely undo everything that happened in the second half, and we'll pick back up from the end of Changelings except Belle keeps Gideon and Rumbelle are happy(ish) together. The episode ends with Rumple and Belle acknowledging the past timeline, which everyone else seems unaware of, and wondering if the Black Fairy knows, too. This would also undo whatever happened in Agrabah, any development between Regina/Zelena thanks to Wish Robin, etc. though, so probably not.

I just wish they had stuck with the redemption of adult Gideon.