This is pretty fantastic and pretty much tells the story. To go with what you said he is one of the top FTA guys in the GLeague (under 21 years old).
Like a broken record, and nothing he will fix immediately, he needs to get much stronger.
10% of his shots coming at the rim is a wild number. Matas and Holland were closer to 40% of their shots coming at the rim last year.
He does need to get stronger, but I think his handle also needs to improve drastically. He's slow to begin with and he doesn't have any wiggle or craft with his dribble. I kinda think the most obvious problem (he's skinny) makes us overlook additional problems.