they would make the cells on that frame because that is where the eggs are :-). if they are queenless and you don't want to mess with requeening them again, you can leave them and let them collect whatever they will between now and your winter. queenless hives are storing machines! when they are done, you can combine them with the other hive and take the excess stores. you can leave them to make, or attempt to make, their own queen so that you don't end up with a laying worker problem, then kill any queen they have made before combining.
if there are no queen cells started, you may want to leave them until spring and then try a split.