There has to be a third party because how do you explain the prophecies or the visions characters have had like the one that revealed the Five to D'Anna or the one that revealed in the Occupation arc to D'Anna that Hera was alive and where to find her. And what about the head entities. I'm thinking this might tie into the Ship of Lights and that could provide an explanation for Starbuck's resurrection. Baltar spoke of angels and said Kara was one. It would avoid her being some sort of Cylon which would be really tired.