I disagree with you there. Size is a byproduct of three things: Genetics(height and body frame), coaching(practices and strength condition build muscle mass), and effort(more sets of pumpin iron, or eating more whoppers, however you want to see this component). The reality is that mike williams has a ton of size from those three components, and that he is really strong, the downfall on him is the effort component is suspect.
From middle school level on up, you are coaching yopur kids to get in the weight room, which helps facilitate muscle growth at early age so they can retain and build this muscle mass easier as they get older.