There were a lot of significant revelations about the Final 5 and Cylons in general during No Exit, the latest BSG episode, but there was one key quote from Sam that I hadn’t seen anyone else pick up on yet:
Back on Earth. The warning signs that we got… They looked different to each one of us. I saw a woman Tory you saw a man. Funny, no one… no one else could see them. Galen you thought you had a chip in your head.
Now maybe it’s just me, but that sounds a heck of a lot like the visions of Six that our good friend Gaius Baltar used to experience. In fact at one point he even thought he had a Cyclon chip in his head that Six had placed there. Sam finishes with the revelation that the 7th humanoid Cylon was named Daniel and we learn via Ellen that John (Cavil) destroyed Daniel’s entire line in an act of extreme jealousy.
Except I don’t think Cavil completely destroyed the Daniel line. At this point six of the seven people we know to have had visions are confirmed Cylons (the Final 5 + Caprica 6 and her visions of Gaius). I think Gaius is a Daniel model, probably the only one remaining in existence after Cavil destroyed the rest. Given his sadism and propensity for tinkering it seems likely that Cavil might even have taken the last Daniel and reprogrammed him a bit to exacerbate his most human flaws as a final revenge before deploying him on Caprica as Gaius Baltar.
At this point we still can’t explain the visions and Starbuck’s resurrection, but there certainly appears to be some kind of external guiding force that has had a hand in events since at least the destruction of Earth.