In addition to providing these OG Fours a place to get a hot cuppa on their way around the Milky Way, the super-puffs were strategically picked to force Fours in a solar system to branch out.
In the case of Earth, the humans were given seven lifetimes to vacate the premises. The stars apologized that the other planets in the human's solar system weren't particularly well-suited for life, but what're you going to do?
Thus the Planetary Outreach Deployment (POD) force was formed. A worldwide effort to put together what was needed to get the humans off their rock and into the stars.
When Jemryl took on the lead position of PODs for Asia/Pacific, she figured Venus or Mars, maybe Titan. Planet Nine though.
The world wasn't ready for Planet Nine.