Moli will never ever develop into a good LB. He will remain average at best. He doesn't possess the footballing intelligence, nor does he have an established skill set in order to be able to take his game to the next level. Running aroung like a headless chicken, trying hard, and putting in tackles everywhere (just because he can fly up and down the pitch) are not qualities that make you a good footballer, let alone a good LB.
DC and Criscito have potential and talent; Moli doesn't. They have a footballing brain and skills which they can build upon, while Moli is clearly and sorely lacking in those departments.
Moli is a suprme athlete, but he really should've considered taking up a different sport, perhaps track and field. Just like Marchionni (buying tractors and aiding his gramps in cultivating the fields), Molinaro's attributes are better served and highlighted elsewhere, off a football pitch.