Not every single recruit in this 2013 class will be successful and productive in college. Many things play a role in why a prospect doesn't pan out, such as scheme fit, injuries, maturation, coaching, physical development, personal problems and of course academics.
However, for this read, when we discuss prospective disappointments I will strictly only project from an on-field/football standpoint. Much can take place that strictly involves football over other variables when a prospect becomes a "bust" so to speak.
Whether they lack a crucial trait to be successful at their position, lack the size, speed or athleticism or may not fully get the playbook, some recruits come into college football and just aren't successful.