3-5-2 is THE EXACT reason we NEED chester. You get the big bully boy center half in the middle, the 2 side center backs have to be quicker to cover and protect the flanks, the wing backs don't sit deep and defend most the time like full backs, they will get caught up the pitch on counter attacks, those 'wide' centre halves need to cover that space, which involves speed, reading of the game and solid tackling ability - ie james chester.
If we're going to play 3-5-2 at premiership level we need to find another james chester, a big lump like jackory hobbs will be tormented on the side. Imagine Walcott running at him with a quarter of the pitch between him and the touchline or him and the next defender