Not to pick on you plasmid, but I think a lot of these are open to interpretation, gonna do my best to present my views.
I took it as a sign that Cavil cheated them out of killing him as they did the others in CIC. It was his ultimate "on my terms" moment.
Firstly, the glowing spinal cords went away mid show, not sure why you think they'd still be around. Also who is to say that the Cylons really represented a huge portion of humanity? On the subject of Hera, I don't think she died YOUNG so to say but probably had at least one child so made it to early adult hood. They did say young WOMAN not child (at least I think so.)
I can believe it. Why keep jumping around when you have a perfectly habitable planet where you can start over? Besides.. I'm at the point where I really wouldn't miss technology should it go away because we are too dependent on it. I'm sure it wasn't all that hard.
I really take issue with people thinking that those from the fleet would just assert dominance and rape the native people. I would think they would be smarter than that and just integrate themselves in even if they had to appear as "gods" or "angels" promoting the "one true God."
This is totally a nitpick.
Never even crossed my mind.
The end payoff of her flashback was to show how she got to where she was. If it weren't for her date with the former student, she wouldn't have realized she should join the campaign, becoming Secretary of Education and President after the Fall of the Colonies.