Stranded?
Williams and Wilmore became stranded when they couldn’t return on the Starliner that brought them. When the Dragon Crew 9 team came up, they arrived with 2 empty seats so they could hitch a ride back to earth. They had to wait until that crew finished its mission, and a crew-10 team arrived as replacements. Williams and Wilmore were stranded initially, so it’s been a useful term to describe those two astronauts as opposed to the others.
Intentionally...................