Barkley can be a very good player, and obviously has the skills within him to be a very good player, but he also has the sloppiness and Inconsitency, over his whole time in the first team, he has had more bad games than good I would say. He had spells under Martinez where he was poor and probably needed taking out the team just to maybe help his learning curve, unfortunately it never happened.
The two telling points for me last night was when Miralles took the ball off him for a free kick and when Bolasie took the ball off him on the wing, no words where spoken, they just done it and you could see Barkley's head drop after both.
This season will definitely tell us whether he has got it to become the player we all think he should be, No one has questioned him before, or even took the time to sit down and explain to him some things he needs to know, also should become a lot tougher mentally through these times. He's had worse games under Martinez but Koeman will hopefully help him actually analyse hom and teach him more than Martinez ever would.