From my own very limited playing experience, I believe the manager has a massive bearing on player performances. In my opinion, Pearson instructed the players to play a percentage based game, where defenders were simply responsible for defendining and playing the no risk ball into the channel. I believe Sousa however wants a great deal more from his defenders, not only carrying out defensive duties but also playing an integral part of the possession game. The risk with this is that when the team loses possession, the defenders have a greater chance of being caught out of position. Consequently, I think the likes of Hobbs and Morrison at centre back have found it difficult to adapt.