I actually had a dream about this. Although the missing Cylon was named Daniel, I think it is StarBuck. Reason I say is because when Helen was talking to Cavil (John) about Daniel, she said he was such a wonderful artist, he would be here if you hadn't tainted the embryos and did something to the DNA. I think Starbuck is the result of the abnormalities that John did. John seems to be so evil, that I think when Starbuck first died, John built her a new viper and sent her back to BSG to frack with the humans heads some more. The reason Starbuck can paint is because she is the artist, or maybe she is the Cylons second attempt at a human model, but they used Daniel as a template and the result was Starbuck. The final 5 created all the other Models, so technically there the first 5 and or 6. I also remember that all the final 5 are in couples, the chief and tori is one couple, Scy and Helen is another, but anders is all alone, that seems odd. BSG is so unpredictable, it could be that in his past life, Anders was gay and Daniel was his lover. Which explains why they have this maddening attraction for each other. Even after Starbuck found out he was Cylon (remember she said she would kill him, if she ever found out something like that) she stuck by him and couldn't leave him. Also alot of artists tend to be gay nowadays, so it makes some sense.