I am beginning to think that Starbuck is Daniel. Maybe not the way you theorize (though it could be), but that she somehow is Daniel. To be honest, I never remember them actually saying that the living Daniel model was killed. I know John poisoned the amniotic fluid so that no others could be made. Here is my very lose theory:
Daniel finds out that John is trying to kill him and he escapes. John assumes after so many years that Daniel is dead. Over the decades, Daniel has done research of his own and built his own facility of sorts. To get back at John he knows he is going to need to be out in the open, but he can’t do it in his own body. So he forms Kara as the model, and he downloads into her.
As an aside, the whole short time they were orbiting earth, I kept having this feeling that there was an underground resurrection facility under the earth. Even now, with them being away from Earth, I still have that feeling. Maybe Daniel made his way to Earth and set up shop there.
I dunno, just theorizing. All will be revealed soon.
