That would be a very good development if it happens.
Okay, so the major Hook back stories (not counting the Crocodile), but the big character changes (from bad to good):
And Straight On ’til Morning 2×22 – Hook was reminded that he could care about someone other than himself and basically gave up his revenge because he wanted more out of his life.
Good Form 3×05 – we learned that Hook the pirate wasn’t always a pirate, but a young lieutenant who believed in ‘good form’ and he became a pirate because he refused to serve a corrupt king. ‘Good Form’ also gave us Emma and Hook’s first kiss.
The Jolly Roger – 3×17 – another big Captain Hook episode that gives us the answer to what was he up to in the year without Emma that led him to finding her in The New York Serenade. Could it resemble ‘What Happened to Frederick’ from season one? Absolutely. There will be a quest involved to help someone who’s lost their true love, in this case, Ariel reunited with her prince Eric. And the big revelation for Charming in What Happened to Frederick was that he loved Snow and would never stop fighting for her because he believed it was true love. So, going by that, this is probably the episode where Hook realizes what he and Emma share is True Love and she’s also his home and this will likely come out in the present and Emma will realize what he’s done for her and she’ll probably kiss him and realize, she truly loves him back and bam! True Love baby!