Did you have a backup set for Koskela? Did you have backups set up in such a way that there was only one across two positions, and three across the two other positions (using reserve obviously)? i.e. player A backing up PG and SG, with player B backing up SF, player C backing up PF, and player D being reserve for SF and PF.
If it's nothing like that, I can help you no further.