Calvert Hall and Mcdonogh both have significant amounts of holdbacks. In fact the one double holdback that everyone rails on constantly is transferring next year from BL to Calvert Hall.
Didn't expect that, if it is the middie double holdback you are talking about. His father is an assistant football coach at BL.
Plus, Boys Latin is also loaded with holdbacks, Crabs is the feeder system to BL. Many, but not all, Crabs go to BL.