Apologies if this has been laid out by smarter people before me:
It begins with Kobol where there are Humans and Cylons.
Kobol has resurrection (for humans and cylons) - and an apocalypse.
The humans go one way creating 12 colonies and the cylons create Earth.
Resurrection is lost to the 13 colonies.
There are either 12 “survivors” (or one) left behind on Kobol, with some elements of resurrection intact. Say, the ability to upload but no bodies to download to. The consciousnesses nevertheless remain ‘live’ and hooked into the consciousness of colonial humans and Earth cylons.
They watch, knowing the pattern of cylon creation, servitude, rebellion and apocalypse will repeat itself.
The final five resurrect resurrection, with some help from (lets call them Lords of) Kobol. The final five travel subliminally to the 12 colonies but not in time. The five halt the war, help develop skin-jobs, get fraked over by Cavel and dropped back on the 12 colonies to witness the third apocalypse.
Cavel manipulates things to his end, as the Lords of Kobol (or Kobol crew, whatever) manipulate things to break the cycle using “head” people. Cavel gets Starbucks DNA at the Farm.
Either Cavel or the Kobol crew use Kara’s DNA to make a copy. The Kobol crew get into Kara’s head and lead her to Earth - knowing the journey will kill her. They use their remaining resurrection tech to squirt her consciousness into the copy-Kara body and send her back to the fleet. Kara is the first human in thousands of years to be resurrected and the line between humans and Cylons is blurred further.
Once Cavel is defeated and Humanity and Cylonity are reunited in mortality and peace the Kobol crew will point them to a new home via Kara, who will have led them to their end. Galactica goes squish and we’re done.
…Or maybe Anders wakes up and says, “Third planet on the left is habitable.” and they all go there.
P.S. This post has been edited to fix the misspelling of Kobol (as Cobol) proving I am neither a human or a cylon, but, in fact, a Muppet.
P.P.S. My previous comments were in no way meant to disrespect Muppets, who are well known for their wit, dexterity and ability to spell.