NASA and Boeing plan to spend the next few weeks conducting tests on the ground in order to better understand issues with the Starliner spacecraft’s thrusters before giving its crew the go-ahead to fly back to Earth, officials said in a press conference Friday.
They functionally do, at almost all points in time there are enough capsules docked to the station for all astronauts to be able to return to Earth. The starliner capsule is currently able to return if needed, they are having it stay up there a bit longer to check things out to better understand why the one thruster is bad.