1. Not nessecarily the poor were the only ones to be left behind. The Space Station does not have the capacity to hold many people. How many people it can hold exactly is something that's yet to be determined. I imagined there were isolated pockets of soldiers, middle-class folk, and just people who managed to miss their shuttle to the space station that were left behind. I imagine the top priority was given to current global leaders, so that when the Earth would be recolonized it did not remain completely without authority.
Mind you, the majority of humankind has been infected with at least some form of the virus, whatever is left over is most likely on Earth. The Space Station gets involved in Arc 2 of the RP.
2. Yeah, the space station forms a thin ring around the planet which is why I called it Ouroboros, where the snake forms a ring when it swallows its tail.
3. I'm not sure what you're question is? What crashed? The hospital ship(Valetudo) is rescuing people that manage to signal it with some sort of radio transmission or flares or something by sending down the Andromeda 'helicopters', which beforehand had acted as a sort of airborne ambulance. They do have limited supplies, they also will most likely check out wreckages or manufacturing plants that may have food or something.