Kobol Humans
Kobol Cylons (Presumably having gone from Mechanical to Organic on Kobol before their departure)
13th Tribe/Colony of Kobol Organic Cylons
13th Tribe/Colony of Kobol Mechanical Cylons
12 Colonies of Kobol Organic Cylons
12 Colonies of Kobol Mechanical Cylons
Now the 13 OCs came from Kobol to Earth 1 4000 years before nBSG. First, they used Resurrection to pro-create. Then they developed the ability to pro-create through sex and abandon Resurrection. They then proceeded to create the 13 MCs. They use the 13 MCs as slave labor which eventually drives the 13 MCs to revolt and wipe out, presumably both OCs and MCs, with the exception of 5 OCs, in a nuclear attack.
The 5 surviving 13 OCs travel for 2000 years to the 12 Colonies, going first to Kobol, not knowing that the humans have left Kobol to establish the 12 Colonies.
The 5 OCs leave Earth 1 at approximately the same time as the Kobol Humans arrive at the 12 Colonies.
The 12 Colony Humans, in about the same time frame as it took the 13 OCs to create the 13 MCs, create the 12 MCs. They use the 12 MCs as slave labor which eventually drives the revolt.
During this revolt, the 5 13 OCs arrive and convince the 12 MCs to cease hostilities against the humans. To do this, they show them how to make 13th Colony Organic style Cylons. Immediately the 12 OCs enslave the 12 MCs that created them.
The Humans originated on Kobol, along with the 13 OCs. However, due to the fact that both the OCs and Humans were able to leave Kobol on their own indicates that they obviously did not destroy each other as, presumably, the 13 OCs and 13 MCs did. It, of course, does not rule out a major war between the two groups that decimated Kobol and forced both to leave at different times (The OCs forced to leave due to losing the conflict, and later the Humans forced to leave do to lingering effects on the planet from the conflict), however AFAIK, no mention of a war between the two races of Kobol is ever made.
This series of events leaves me with several questions and thoughts.
1. If the 13 OCs left Kobol and arrived on Earth 1 of their own volition, then how did the "cycle" start on Kobol?
2. If there was a conflict between the 13 OCs and the Kobol Humans that forced them to leave Kobol, then why didn't they, machines and presumed victims of the "cycle", not remember the mistakes that were made and create their own MCs and then turn around and enslave them? 2000 years is not an amount of time that would account for the loss of that type and magnitude of knowledge in the slightest. Especially taking into account that the historians in question are advanced computers with highly advanced technology.
3. When the 5 13 OCs arrived in the midst of the war between the 12 Colonies and the 12 MCs and then proceeded to give them the technology to create the 12 OCs, why didn't the 5 13 OCs inform the newly created 12 OCs that enslaving the 12 MCs would lead to their destruction, just as enslaving their own MCs had led to theirs?
4. If there was a conflict with the Kobol OCs that forced them to leave Kobol, both things that signify a very advanced civilization (the ability to create advanced A.I. and interstellar flight) why didn't the Kobol Humans have records of what happened? They were sufficiently advanced to keep and have accurate records, even over the course of 4000 years.
5. How did the space faring Kobol Humans lose their highly advanced technology once they landed on the 12 Colonies, only to rediscover it in 2000 years?
7. Head Six and Head Baltar strongly imply that the "cycle" began on Kobol, however if there was no great conflict on Kobol, then how did the conflict start there? Based on what we know, violence between Humans and Cylons actually only happened once, as the first instance was actually Cylon on Cylon violence. Two different types of occurrences is hardly a "cycle".
8. Is the "cycle" simply considered to be Human vs Cylon violence? Or is it perhaps just the inability of organic beings and machine intelligence to co-exist, which is more closely supported by what we see and know. (The Organic Cylons are basically humans with some extra abilities and all OCs view MCs as lesser beings to be enslaved)
9. Head Six and Head Baltar are obviously intelligent enough to know what a cycle is, so with that in mind and taking their word that there actually is a true cycle of violence it is reasonable to assume that the "cycle" has been repeating itself far before Kobol.
10. With the above in mind, I think that it would be reasonable to assume that Head Baltar, Head Six and "God" are highly advanced AIs/Organics or a combination of both, from a previous incarnation of the struggle between organics and machines. That explains their interest in it, their cold hard logic and their compassion towards both sides of the conflict.
11. If the Kobol Humans created the Kobol Cylons, and there was a conflict that forced the Cylons to leave Kobol, then why would the 13 OCs need to warn the Kobol Humans not to do something they already did? This indicates that there was indeed no conflict between the Kobol Humans and Kobol Cylons. It may also indicate that the Kobol Cylons were created as Organics and never went through the machine phase.
12. If the time line is accurate, then both the Kobol Humans and Cylons have very short memories and have poor, or no proper processes for recording history. If that is true, then Lee Adama's decision to abandon all technology, was indeed the correct thing to do as, if they did immediately start rebuilding their culture/civilization, in 2000 years they would have forgotten what had come before and would have created machine slaves again, thus actually carrying on the "cycle". Whatever that may actually mean.
These are some of my thoughts and questions on the time line and events that has been wrapped up. Questions, comments, flames are all welcome.

P.S. Thanks to Bounty for letting me bounce some of these ideas off him.