A fully fit and in form Gallas is obviously going to play before Bonucci, Rannochia or any young defender brought in this summer. But it is important to implement the young defender into the team over the season....giving him the full time job may be asking too much of him, but not playing him enough is going to dent his confidence and form....there has to be a balance.
At the end of the day, having chiellini, gallas, bonucci and legro isnt bad for a team that finished 7th and if qualified, in the europa league.