I think that Spirit is stuck because I was writing past the ending; it was stuff I needed to write, I think, since it was important character development, but I don't know that it will end up being in the final piece.
It's fun to go back to the sequel; I love those characters so much. It has a bit of the feel of a YA novel, and I wonder if that's how I might market it. It might be a better first attempt than Spirit would! Who knows.
Gotta finish one before I can start thinking about what order I want to try and publish them in!