What we learned in his 2 seasons here, imo, is that he is not extremely motivated player.
In his first season, he had problems with trainings, stretching, eating, learning Spanish etc.
Then in the 2nd season, media started to write bad about him and there was a lot of talk about him being sold.
Then we have finally seen some: "Fuck you, I will prove you wrong" attitude.
Then he got injured again, and his current body language and attitude is again closer to his attitude from his 1st season than to that "fuck you" period.
He has a lot of talent and he surely can produce magic out of nowhere.
But for now (it may change in the future), he is still giving me Balotelli/Brasilian striker Adriano vibes.
Talent is there, motivation is questionable and hot and cold.
His IQ and decision making is still questionable.
I didn't believe that he will improve in this season.
But there are still a lot of huge flaws in his game, mostly in a mental part.
People will reply: he has improved mentally, he is young. He is not late for trainings anymore.
I am not saying that he has zero motivation.
But for now, he doesn't strike me as a player who is 120% focused only on his job, on trainings, on tactics, on every match, on every action, trying to improve all the time.
I guess that his mental problems are a mix of:
1. his natural laid-back personality
2. getting filthy rich at the age of 20
3. media hype of a current internet era which turns you into a God among fans and that can get into your head easily, lowering your "need" for self improvement and working hard on yourself, since: you are a God already (remember how Halilovic said in Hamburg: I didn't come here to run or defend, lol)
Time will telly whether we will see consistent streaks of his good form for Months or will he always stay a laid back player who will play matches with 50% and offering 2-3 magical moments per match based on his talent alone (and who plays at 100% only when everyone are on his back and against him).