Jesus and God claim to be farmers, or herders. Could this planet be the only possible one with life in this vast universe? Everywhere we look God is super effencient with resources and space. Did God forget to do the same throughout the universe, and only got it right on Earth? Is this universe the only one farming creatures too?
Personally I think these little aliens or what ever, came to Earth when it didn't interfer with our development. These early earthlings didn't really know what they were seeing, and kept going unaffected pretty much. If they came now, this would change how we think about ourselves, and the universe, and totally change our natural advancement from now on.