The mythical 13th Cylon

I was reading on a blog today that mentioned that many Battlestar Galactica fans believe that there is a 13th Cylon. And many believe that Starbuck is that cylon.

Well, I think this is close, but not quite right. I think it's been suggested that the lost 13th Cylin was a boy, ruling Starbuck out. But, what if that Cylon was her father? What if Kara was the first Cylon/Human hybrid? I don't were they could go with this and I'm probably wrong anyway but it's as good an idea as any!