My problem with the Cheif being a Cylon, is that he was messing around with Sharon --- or rather Sharon was trying to mess around with him to have a Cylon/Human kid. If he was a Cylon, what would have been the point of that?
Well, Sharon didn't know she was a cylon when she and Chief first hooked up. After she started to suspect, they broke it off. Also, Sharon (in any form: Boomer/Athena) didn't know Chief was a cylon. I'm not sure any of them knew, except for #3 (Lucy Lawless) who saw their faces but was promptly boxed. I think the Chief/Boomer relationship has even more dimension now. I wonder if he'll attempt to talk to Athena (Helo's wife) about any of this, or if all 4 of them will keep it to themselves for as long as possible.
So now there is a SECOND half-Cylon baby. So is now their baby just as important and mythical as Hera?
I seem to recall that Hera was never meant to be alone, that she would be one of the first--to lead "God's children." Another hybrid is an interesting premise indeed.
I also think that the series is redefining what a cylon IS at this point. What we know about the final 5 are limited. We know that when the topic was brought up, someone said "we don't talk about them." I think it was 6 talking to Baltar.
It's anyone's guess what happened. My theory is there was obviously a rift of some kind between them. They had a difference of opinions. The cylons we first came to know: 6, boomer, 3, the priest, leoben, etc. seemed to be the ones who initiated the war with the 12 colonies. They seemed bent on the destruction of the human race and interested in creating hybrids (i.e. pairing Sharon/Athena with Helo.)
The others were obviously of another mindset. Perhaps they broke off because of a clash of ideologies. Perhaps they rebelled and decided not to try and destroy mankind. They obviously have 4 sleeper cylons planted in positions of power: Tori as assistant to the pres, Tigh as second in command under Adama are the two. Chief and Anders not so much.
We also see that these cylons are different. One obviously has aged. Tigh was in the military for a long time, which can be confirmed by Adama. Adama knew Tigh as a younger man. Perhaps these cylons were more interested in becoming MORE human, creating cylons that aged, that had massive flaws. One thing that keeps popping into my head is that of free will. The original cylons (6, 8, etc) seem to work for the collective (for the most part.) Perhaps the others created themselves to have more free will, to BE more human.
I think the new cylons are protecting Earth or have more of a vested interest in Earth in some form or fashion. Will be interesting to see what Caprica 6 and Athena do when faced with the new models. They seem to be willing to follow their own will and hearts above that of the other collective.
Lots to ponder!