That would mean that the Ellen Tigh we knew was a total facade? Bad plot device.
Someone is definitely manipulating the situation. So many people are having visions that lead them to this point. Roslyn with her visions of Earth and the temple. Starbuck with her visions of the comet signpost that lead to Earth. Diana with her visions of the final five every time she died and was resurrected. The writers have a lot to wrap up but so far I like your explanation.
That’s quite a transmission range.
I wonder if the human skin jobs of Earth were “human” to themselves. They had kids, as evidenced by the jacks Dualla found.
Then the final five could be “biological cylon descended humans” of the cylons who fled Kobol.
Big leap of how they could be on Earth 2000 years later:
The human beings descended from Kobol cylons are human. They’re mortal. But like many, they don’t want to die. What if these final five created a hybrid type technology to download “human” conciousness into engineered biological bodies? This would be like the cylon mind download, but the “original” mind was from a body born as a baby. Now you have a human stepping into the cylon download immortality scenario.
This could explain why the final five are so much more human. Because, in their FIRST life on Earth, they WERE human.
All you need then is a body that doesn’t age or deteriorate, or a way to replace that body when it fails. The Colonial cylons picked the latter. What if the Earth humans-to-cylons picked the former? Download once to a body that won’t die unless an extreme event happens.
If all the other humans could have that kind of technology, you’d end death - except by murder and suicide. But it’s a kind of immortality.
Just never create the mechanicals who would hate you, and you have the best of both worlds. Human souls, immortality, option to make kids to fill up a new world ...