tired: humans discover an ancient progenitor species seeded the galaxy with DNA, explaining the strange predominance of humanoid aliens
wired: humans make first contact with aliens, all strangely humanoid. over time they gradually discover that they are the only humanoid species whose fossil record includes even remotely comprehensive evidence that they evolved on their planet; every other species appears suddenly, with their scientists having collectively concluded that they were seeded by a mysterious progenitor species. awareness of humans starts to spread throughout the galaxy and things start to become Interesting for humanity
