If the player is a 3* player and 1 skill point away from the next star, a person two levels below you will see the player as a 5* and 1 skill point away from being a scout.

If you allow him to gain that 1 skill point, the player is now a low 4* player, no longer accessible to players 2 levels below you and will be the worst possible 5* player available to a player just one level below you.