[tanknetter]

Recall when the Cylon skinjob doctor removed Kara’s ovaries on Caprica ~ there’s your answer.

It's obvious that there is another, unrevealed, party involved who is manipulating things. Could be the Cylon "god", or some other entity that has not even been mentioned in the series.

For Starbuck II to be a clone made from the eggs of Starbuck I would mean that entity managed to obtain Starbuck I's eggs from Caprica.

[Tuxedo]

Could also be an Imperious Leader lurking somewhere. I often wondered why that particular character has never been referenced in the reimagined series.