I've heard some cite Sokratis in that....but I think it was poorer from Kola and the goalkeeper personally. As we were standing perfectly in a line of 5, Sokratis might have properly just come out for it and meatheaded it away.
Once Leno had decided to come out, he really should have cleaned everybody out to get his hands on the ball. I think he needs to work on that part of his game especially. De Gea who some muse basically never comes off his line is at least decisive about what he is doing.
Chilwell is a good player.... (I assume he is left sided...?) though he does not pass the ball when he should far too often. He along with Daniel Sturridge are two players Wenger would have never have signed in a million years for that tendency alone. Think Leicester would charge far too much for Chilwell though and I'm already hearing reports we are skint for the coming windows.
Anyway AMN can cover left back and is actually better defensively than Kola and Bellerin, is quick and much better fitness wise than Kola IMHO.