[AgentZero]

It's possible some variety of chromedome created the human cylons. From what I remember, humanity created the shiney ones, the shineys achieved sentience and fought a nasty little war with humanity, at the conclusion of which the sentient robots left human space. At some point after that, the chromdomes could have created the human variety, but I think it's a bit odd that the fleshy ones would have then taken a leadership role, while subsequent shineys were demoted to the non-sentient variety we all know and love today.

Of course, this all seems like an awful lot to have happened in the 20 years that the cylons were behaving themselves, so it's likely development on the human cylons began sometime during the war.

Or something...