Because Arsene only uses him in useless friendlies or Subs him in games where the game is usually already won. He's proved to have awesome skills and he's often won a lot of games for the teams he has been loaned out for. All he needs is a real chance
He went to west brom last season and didn't do as much, unfortunately for Arsenal, la liga fits his style and the defenders are brilliant at letting him do the above
Even though EPL is not his style like most mexicans.... He gave west 4 crucial points that kept them in the first division. He's doing the same at sociedad. Wherever he goes he does his job and a great spark for a team who usually struggles.... Imagine giving him a real chance next to RVP.... C'mon Wegner...