Good point about the "first" hybrid.

It occurred to me, though, that we may be operating on a false assumption that only the cylons are interested in creating hybrids (Hera, the experiments on Caprica, etc.) What if Starbuck is a hybrid created by HUMANS on Caprica after the first cylon war? Perhaps as some sort of genetically engineered "super soldier?"

Let's say Starbuck's dad was a "skin job," maybe a spy sent on a reconnaissance mission some years before the big attack. He could have been captured and "mated" with Starbuck's mother (who would either have volunteered for such an experiment or had been an unwitting participant). Either way, Starbuck's mom would have ambivalent feelings toward her daughter, which could explain her abusiveness.

As this series has shown time and again, cylons aren't always bad ... and humans aren't always good. It would be pretty strong drama for humans to have some "hybrid creating" blood on their hands.

Another possibility is that Starbuck's cylon father and human mother met and fell in love naturally (like Helio and Athena), and that Starbuck's mom found out after the fact (which would, again, explain her abuse toward her daughter).