Yeah know he was benched alot, mainly for inconsistent work eithic because he blew everyone away in individual plays. And yeah he has bit of a temperament, I was suprised first time I saw him in some NT youth game, was really fiery and aggressive for such a technical player, but quickly realized its a deceptive quality. Not a Pavel type, because yeah hot and cold, just decided in certain time periods he wouldnt put in much effort to performances.
Though this is not uncommon for young players, and I'm not too worried about it (can be polished, someone like Ferguson for example is great). He is having his real breakthrough season, polishing his game, because besides lack of effort, his main problem was decision making (was set on doing same runs/dribbles regardless of sitautions, hence bit raw), but this season, and saw bits of it last season, he defenitely improved on that (and while playing different role to booth). Not too worried he will lose his groove. Or decide he wont bother anymore.
If there is a worry, it would be when things turn sore, benched, injured etc. Character shows in those scenarios. For example Robinho is a fantastic talent/player when he wants to be, but any setback at all, and he completely shuts down his productive performances. Poor attitude/mindset, footballing wise (though can bit mix and such, someone like Zlatan or Balotelli can have poor attitudes, clashes or setbacks, but it rarely effects their actual performances).
I wish it was bit simple at times, for example, someone like Jovetic, kid has talent AND the unquestionable fighting mentality/attitude, gives his all, regardless of games.