I wonder sometimes, perhaps the other five cylons were killed off for some reason. Either accidentally or intentionally. Granted, I am basing this solely off of the expression of Caprica's face when she said "we don't talk about them anymore."
It seemed a expression of deep shame/regret/pain as if something was done to the other five.
Though, I readily admit that I am perhaps looking too deeply into this.
Another theory of course is that the Cylons are lying. Completely and utterly. That wouldn't explain Baltar's vision of the five or Lawless' (forgot her on screen name and am too lazy to look it up in IMDB even though that would have cost less effort than writing this sentence. It wasn't Dianne was it?), unless he heard about the five before the vision and he just fabricated it.
One other thing about Lawless' character: If suicide is a mortal sin and she keeps killing herself why aren't the other Cylons stopping her? I'm assuming that it's just the one individual. I mean, they must figure it out eventually, what with the welcome party everytime she downloads.
