The 13th Cylon--NO spoiler warnings

Of course, don't you see? With all the association of BATTLESTAR GALACTICA 
with religious imagery, 12 models of cylons, 12 worlds of the colonies, 12

tribes of Israel, 12 apostles, 12 gods of the Greek/Roman pantheon, etc. 
yet, what's gone unsaid, unnoticed, unmentioned is the obvious:

THIRTEEN!

It makes sense, dramatically speaking, from a meta-story point of view.
Even 
in-story, all the time and energy spent on hiding the "Final Five" cylons 
are a diversion to hide the thirteenth cylon.

Like Judas or Loki, the 13th cylon would be a viewed as a betrayer. But a 
traitor to whom? cylons? humans? both? or ... someone else?

Mark my words, there is a thirteenth cylon model--perhaps the original
one.

-- Ken from Chicago