FSS is essential to knowing in which areas the potential recruits will grow. The details you get, in essence, are the potentials. When you FSS a player, his high-potential areas will be blue, and you can expect a 21+ point growth in those areas. His medium potential areas will be black, and you can expect 8-21 points of growth in those areas. His low potential areas will be red, and you can expect 0-7 points of growth in those areas. This will help you project what the player will be like as a JR and SR, rather than how he is as a recruit.