This could make any sort of plan that factors in designated feeder MS attendance a little tricky.
Just think of schools of similar enrollments, lets say 500 students. How many middle schools will these schools typically have? I just don't see what the difference is if public school X has one middle school and private school Y has five? Both schools still have the same # of kids to draw from within their high school.
Public School X will probably keep the greater majority of their middle school students, while private school Y will most likely lose way more of their students to other public schools because those public schools are closer and there is no tuition to pay, compared to the private school they could attend.
It's all based on, to this point, a non existent feeder MS attendance multiplier and I am just saying if that type of multiplier did exist and if school A & B combine for whatever reason in 8th grade what school do those kids get counted toward?