Despite Moore's insistence to the contrary, I really don't think that Tigh, Tyrol, Anders, and Tory are cylons. I also like the idea that they're earthlings. They could be more sensitive to picking up an earth radio wave in some way, through dental fillings or whatever, and it would explain why they feel a sense of memories of their childhood when they hear an earth song. Perhaps the Seraphs (god like beings in the original series) are aware of both the earthlings and the colonies and want to help reunite them. So, the Seraphs kidnap five earth children and bring them to the colonies and guide their lives to end up in strategic positions to help bring the colonies to earth. We know where the four revealed "cylons" end up, and it fits for Starbuck as well. Her mother knows she's "special," perhaps she knows about the Seraph's and their plan as she wwould have been given Starbuck as a young child. Since the Seraphs are watching over the five earthlings, they saved Starbuck right before her ship exploded and brought her to earth, and now brought her back to the fleet to guide them there as well. So the "different-ness" that Tigh, Tyrol, Anders, and Tory are experiencing is their earthling genes, not being cylons.
Now if the Seraphs are brought in, there's a Count Iblis figure to introduce as well. (an evil Seraph form the original series) Perhaps he didn't agree with the other Seraphs that the colonies should be reunited, so he influenced the creation of the cylons to interfere with that plan. The "one god" that they follow is really him. He would know about these "five earthlings," but perhaps he doesn't know who they are. Thus the cylons know there are five "special models," but don't know what they look likeor anything about them. Because those five aren't actually cylons at all, but earthlings.
Also, the more religious members of the colonies somehow tap into the Seraphs consciousness or whatever and come up with prophecies and religious documents based on the pieces they gather. Therefore the colonies have many gods, i.e. the Seraphs, and it would make sense that they would have five priests, being the five earthlings who will lead them home, and prophecies which also help lead them home as well.
Or I'm thinking way too hard about this.
