I cant think of a single qualty player that there is a problem with at Everton, good players coming to the club and happy to work with Koeman, existing players signing extensions. All the decent players seem to be happy.
If Koeman or the club are in anyway at fault with Barkley I would guess other players might of developed a strained relationship aswell but they havent. We have one bad apple, which tells its own story.
Maybe there are problems with Joel and Niasse, while i like Joel if the lower end standard players have problems thats not really a big issue for us