when Pep took over he had the oldest and smallest , height wise squad in the league, it being old also meant it was one of the slowest, Pep changed all of that as fast as possible, you need all attributes and options in a squad, otherwise teams identify our weak points, this happened against utd and in nearly every game where we have dropped points for the last 2 seasons. Pep has said Walker can play as a CB giving us 6 CB`s, good for a 3 or 4 at the back, bringing in Davis for Gomez means we have an extra option where we had none,, Frimpong also gives us more options, both Davis and Frimpong can cross a ball, pass, control the ball, dribble, and shoot better than Walker, they are also aware of what is happening on the pitch better than Walker, and he is better than Traore. This does not mean Walker is a bad footballer, just a disaster going forward, so we do not use him for that.