I dunno. I think that less is more in this situation. He really felt isolated, left alone, looking at his departing ship. Make it a ceremony, and... I don't know. It seems too obvious. It would have cleared up some things, but at the same time, I'm ok with there being specuation. I prefer the mystery. One guy does it alone, you wonder what it's about, who the others are who fy away in the ship, etc. Otherwise, it's "Aliens made life on Earth- specifically, that group of dudes."