My opponent had one in this game
(8597366) about 5 minutes from the end, and that was only a few weeks ago. I think they've developed the match engine so that other players come in to fill vacant slots if possible before turning to lucky fans (I think I had a PG and SG both playing C on Thursday because of injury) but obviously this guy only put out 5 players, so when stamina trouble hit a lucky fan had to be brought in.