Well, your ghost did have an entire planet (maybe even half of a solar system) to search for one corpse among billions other corpses and skeletons. I can take a whole week to find the TV remote in my own small house, I can't imagine having to search for it in an entire planet among billions of other remotes. Also, your Ghost has dialogue which says he searched the Cosmodrone once without finding you, and decided to come back later, I'd imagine that may be a pretty big set back.