Green is an enigma.
He has such bad handle that he often can't perform the most basic basketball offensive maneuver--the layup. For Christ's sake, every player who ever played the game starts with that basic shot and they use it as a drill before games and practices to loosen up and Green makes it an adventure. Every time he drives, it is an "I can't look" moment.
His 3pt shot isn't consistent. Comes and goes. When he is hot, he is capable of lighting up the court and setting records, but when he is cold, he goes an entire game without making a shot. How does a coach use someone like that? He makes the starting lineup and finds that his SHOOTING GUARD can't throw the ball in the ocean.
He can play defense--when his head is in the game. It seems that when his shot is off it gets into his head and he lets his defensive effort go down as well. But when his shot isn't falling is precisely the time when he should compensate by giving the most effort on defense so he isn't a complete liability on the court. I think the way he played himself onto the Spurs was by his defense. He really needs to concentrate on that when on the court. It is a skill that is best demonstrated by effort and he can give that every game if he keeps defense first in focus.
You always want a player to work hard on his game to improve areas of weakness and develop new strengths. Kwahi is said to be a super gym rat always working on his game. I don't know if DG gives that effort. Can you work on concentration, consistency and basketball smarts?
All that being said, I feel sure the FO will probably bring him back if a reasonable salary increase can be negotiated.