As I said in replying to someone else, I found the interviews for the season 3 DVDs fascinating - either Robert Wolfe or Ron Moore (can't remember which one) says that the original ending for "Second Skin" was that Bashir tells Kira that it can no longer be ascertained whether she was originally Cardassian or Bajoran, i.e. Iliana or Kira Nerys, and she then decides that it doesn't matter any longer, that she is Kira Nerys now. So I was perverse and wondered which canon circumstances would have to be altered for Kira to make the opposite choice, and suddenly it became obvious...