What I've been able to see,
@jking948 - is Nwaba makes some young mental mistakes on defense when his offense isn't going well. Keep in mind the Bulls were also tanking last year. Once he established himself as a key positive player, many of the other veterans were benched around him.
On offense, he has established a strong baseline game, as the highlights from his 76ers game illustrates. However that was his best game shooting from the outside, maybe in his career. While baseline drives are his bread and butter, he needs to become more respectable hitting corner threes to keep his man from sagging off.