Depends on what position they play and who is on the roster next year. The C spot is the only one that kind of have some level of opportunity. If Sasha comes over and Barnes comes back or they sign a win now wing then the F spot is pretty much handled. The minutes have to come from somewhere.
I think you are underestimating having twins and how much we can switch their jerseys to keep them on the court. Imagine refs giving 12 fouls to the same player...