SPOILER WARNING
Today I've started to suspect the President, Roslyn, could be the 5th.
The other four wonder how come the 5th didn't hear the music as they did. Maybe Roslyn didn't hear it for the same reason she gave for missing Starbuck at point blank range.
Sarpedon










Supposing a correlation between twelve models of Cylon and twelve tribes, if the billions of Cylon
become mortal requiring procreation to continue as a species, they could lose their technology for awhile and generations later make metal robots who rebel and
so it all loops. I wonder if a legend of a 13th tribe also suggests the possibility of a 13th model or could a legend of a 13th tribe/model be a metaphor for
the final children of the twelve.
