So as far as Gideon becoming a baby again, to me I think it only makes sense bc it was Black Fairy’s doing that made him age the way he did. Unfortunately we know next to nothing about the dark realm and it’s fast forwarding capabilities but bc we know nothing, I have to guess that black fairy could have sped up the realm in order to get serviceable kids working in her mines to extract the black dust she used for the curse. So if that’s the case, then Gideon aging was entirely black fairy’s doing therefore if the black fairy dies, it makes sense that whatever happened to Gideon would be undone. At least that’s how I’m rationalizing it.
As far as Henry kissing Emma and saving her….this is tough but I can almost buy it. Although while Emma did kiss Henry and did save his life, she also broke a curse. Henry didn’t break any curse here. But I’m willing to maybe let this one slide.
The Snowing kiss MAKES ZERO SENSE. And it made me quite angry. The whole beanstalk stuff made me angry. Hook should not have just survived from that fall. And Charming can’t be brought back from the dead by TLK. The only way I can rationalize this is if, like Hook, Charming survived the fall and was just passed out, and then the kiss didn’t actually save him from anything and it only served to reverse mirror the pilot. He just happened to wake up when she kissed him.