Probably I understood what Cuellar thinks. Oxlade is playing very well on midfield because has the quality to be in this role, but like Coquelin, like Elneny, like Ramsey he can't be the brain of our build up possession.
Oxlade should be a fantastic half winger (like Ramsey) but on midfield we need a brain like Santi Cazorla and Mikel Arteta.
We can't control the game with BRMs and BTBs.
Do you know why Ozil is pkaying differently than the past and Iwobi is a regular starter? Bevause the african winger has a good first touch and good passing qualities which can help the midfield to have an alternative to pass the ball and keep her.
Mustafi has an high number of forward passes because he hasn't a reference in front of him.
Can Xhaka be the brain of this squad? I don't know. He has very good qualities but isn't mobile.