Sim has some fundamental skills. But he is so out of shape thay your can see that he won't be able to make those moves in a real game because he'll be out gas constantly.
He nreds to lose about 30 to 40 before he has a chance to stay in the league.
The challenge with a player like Sim is we don't know if it's a matter of losing 30-40 lbs. He may still be too slow and immobile to be an NBA player. It's why you stick him in Reno and see what happens.