If that were the case, why start over from scratch?Voilà it has a new brother, Unique and created in the same fashion as it was.
The history and development of life on planet Earth is pretty reliably tested, documented, and theorized (scientific definition). The history of human development even more so.
If they started that concept about a million years ago, or just 250,000 years ago if they ever only influenced human development, what would be the benefit of going about it from the "beginning?" Just to see if they could?
When i ask these questions, i ask your thoughts. I'm not asking anyone to tell me what hypothetical aliens do, as some of the answers I receive suggest people think I am.