The problem starts with the fact that he has the physical presence and strength of bok choy.
The next problem is that his ability to process the game and make decisions hasn't adapted to NBA speed. At Colorado, he could size up the defense and make a decision how he wanted to attack. Then he could just use his length advantage to get by his defender and score at or near the rim. In the NBA, there isn't time to think. Everything has to be repped out to the point that it's muscle memory and the player can just react. Cody can run a set play--for example, he can take two dribbles, drive down the lane and kick out to the corner--but he isn't able to improvise much. He has a ton of rep work to do in order for his reactions to become intuitive.
The underlying question is whether he has the competitive drive and passion for the game, or if he's just going to coast through his first contract and sip gin and juice, with his mind on his money. Guys like Cody--just like Cam Reddish, Kevin Knox and Ziaire Williams before him--get 2nd and 3rd chances, simply due to their physical tools.