My theory is that he is too nice, for himself and others. That's why he never really achieved the heights he coukd/should have.Loved JJ - became a scapegoat at the time for many shit performances much like Sissoko atm. Always speaks well of the club and sounds quite knowledgeable
All top players have strong and often self centered personalities. Kane made that joke about Son but I m convinced that he has also made the same comment directly to Son himself and with a completely different tone of voice as Son is a bit of a solo boy at time.
JJ was more the Dembele type, lacking in that obsessive trait you need to be top 10 in your position worldwide