The Cylons have evolved, but they still are not the sentient living creatures that they desire, more than anything else, to be. That perhaps their interpretation of God requires of them. “Be fruitful and multiply.” They cannot do this.
They can manufacture more toaster models from sheet metal and spare cogs and rods. It seems clear now that the human appearing models require something else, something that they can only get from real humans.
I agree with the earlier speculation that we shall soon see a 13th model, that is built out of whatever was removed from Starbuck in the second surgery, probably an ovary. At some point, we will probably find that at one time there really was a Sharon Valerii, who was harvested by the Cylons; a Number 6 too, whatever her name might have been. There probably was a real man, who had a testicle stolen, whose remanufactured duplicate was ordered out of the airlock by President Rosslyn.
I think we will find they can manufacture the human appearing models, using reproductive organs stolen from humans, but they cannot reproduce as living creatures do and this frustrates them terribly. They are not living up to God’s demands on them as they understand them. It explains why there are only 12 models. Remember Number 6 marveling at the variety of humanity and she walked around Caprica City before the initial attack in the mini-series? She, they, want that kind of variety among their kind but they cannot accomplish it on their own. In their (collective) mind, subconsciously anyway (do Cylons have a subconscious?), there is a nagging fear that they are not fully alive until they can reproduce. They need humans, at least for now. That is why they have allowed a handful humans to remain alive in the galaxy. For all of Galactica’s and Adama’s heroics, they live because they were needed.
Boomer said that some of her “people” think that love is the problem, but that is a red herring. Perhaps we will find out that some other Cylon scientists are looking for a “divine spark” that explains how humans can reproduce, as living creatures do, while they can only duplicate.
Anyway, what I am saying in my long ramble, is that the Cylons’ plan and their problem is to use humans to try and figure out how to bridge the gap between humans and themselves. Number 6’s baby and Boomer’s baby, if they exist and are not lies, are stepping stones, but I do not think that they are not the ultimate goal.
As to my “if they exist” aside in the paragraph above, consider Number 6’s preganancy. She exists only in Baltar’s mind since the initial attack, so either he impregnated her back on Caprica, there was DNA transfer after the attack that we cannot understand, or she is lying.


