Melo will never be an NBA player 
Well actually he IS an NBA player. With an NBA contract and has NBA minutes and a few points.
Now to say that Melo will never be a GOOD NBA player is a little more debatable...

Now this is also showing the impatience of people. Melo has been playing ball for what? Around 8 years? Only the last 5 at a high level. The guy first had to grow into his body. Then when he did, it grew a little too much, so he had to get in shape. And then learn how to play with that new body.
You can see the wheels turning and see what hes about to do or wants to do. Which is part of the learning developing process. You can see he's getting to the right spots, and can get his hands on the ball too. Now that thinking needs to become reactionary and 2nd nature to play in the NBA on a nightly bases.
Will that happen? Who knows. He's much better then he was last year. It doesn't really say much, but he's not digressing.
On possessives OK looked solid. Nice shot, smart with the ball, and doesn't rush things.
Mitchell look really good. Nice shot, nice ups. Need to get rid of Lee and Crawford to make room for this guy. I know its early, but if we are in tank mode he's worth the gamble right now.