I agree with ThongPrincess- I would suggest a captain's meeting regarding this issue and seeing what the other teams think. If you don't have a rule in there regarding subs and when they can bowl/ can't bowl, you need a specific rule in place. Most of the leagues around here will allow for 1 or 2 makeups if there is some reason you can't get together a legal lineup, but both teams have to agree to the makeup and it has to be done within 7 days of the scheduled week you are to bowl against each other. Pre bowling is not allowed in the adult leagues around here, and if you can't get a sub, you usually will lose either 10% of your average per game, or 20 pins a game...
Matt