Battlestar Galactica, wtf is going on

Ok, so a working knowledge of BSG is important here, so I'll do a brief overview.

The series starts out in the "middle" of the timeline, essentially. There are 12 colonies, united in a democratic sort of government, each on a different planet. Years ago, there was an uprising by robots created by humans (cylons), and there was a big war. After the war, no-one had heard or seen from the cylons, until the series beginning. The Cylons attacked the 12 colonies, nuking them into oblivion, and the few remaining humans, roughly 50,000 people, fled.

So, the humans run throughout the universe, maintained by the notion of reclaiming an ancestral homeland, Earth. According to the dominant religion, Earth was the settling point of the 13th tribe, the 13th colony of the original human species after their exodus from the planet Kobol. So, the president and the commander of the military fleet make a decision, to attempt to find Earth to make it their new home.

After a while, time goes on, 7 Cylon models have been discovered (there are multiple versions of each cylon, all of them look human), and the existence of 5 more have been revealed, 4 of whom are known (2 characters of medium importance, 2 of minor, are revealed to have been cylon, not human). The final model is still unknown. There's been a civil war within the cylon fleet, and some of the 7 models have broken away to join with the humans in their search for earth.

So they find earth, it's a devestated nuclear wasteland with no signs of human life but every indication of having once been a cylon colony. The four "newest" cylons all start getting flashbacks, remembering having once lived there and then dying. During this, one of the major characters, a fighter pilot, finds the wreckage of HER plane and HER dead remains and gets really confused.

So, there are a few explanations that I can think of, some of which I like, some of which kind of suck.

Everyone is a cylon. There was a civil war, the survivors of whom fled the 13th colony to form the original 12 colonies, everyone forgot, now they're being led back together by some form of destiny or something.

Starbuck (the pilot) is the final, 12th cylon. I have no idea how this explains anything.

Helen (one of the four revealed later in the seasons' wife) is the fifth cylon. She has some master plan that involves tricking everyone into banding together and trying to live in peace. Or something.

The original 13th colony was a cylon colony, a planet of sentient robots that had opted to split away from the human colonies and live seperately (the cylons did some twisted version of this halfway through the series, but it didn't last). The original 12 colonies somehow attacked them, sparking a malovelent remnant to attempt to destroy human civilization, in order to drive humans and cylons together, or in order to destroy them both.

Funny posibility: Gaeta is the 12th. This is humorous because of the last episode, and only humorous in a classically ironic way.

Nothing really makes sense. I love this show. If you haven't watched it, get netflix and order it (start with the miniseries, and skip the "Razor" made-for-dvd movie thing in the middle of it all, it kind of sucks, and may have a really important plot point, but may be just filler, and the whole plot is stupid).