The main point of your previous critique was that if Richards had talent, he would have had games where he flashed against lesser compe ion. That's exactly what happened in the summer-league game. I totally understand why you don't think he'll make it in the NBA, but since he met your own benchmark for showing he had talent, I don't understand why you refuse to acknowledge that you were mistaken in that regard. That's especially true, since most of the shots he made are ones he'd get in the NBA, such as his three-pointers and turn-around fade-aways.
I think Richards could score in the NBA right now. The only baskets that would not have worked were the ones where he kept barreling into his man. And the layup he missed is one he'd have open the majority of the time, especially in the Spurs' offense where the center catches the ball there after he crosses half-court. However, I don't think he understands the game well enough to get into the necessary positions to get the ball, and that very well may not be fixable. He also seems extremely self-centered, which affects his ability and desire to play the game in a team context. He definitely seems like d-league caliber to me, about where Joseph was as a rookie. He's more talented than Joseph, but he definitely doesn't have his work ethic. Honestly, I think Richards should have tried to enroll in a university for a couple of seasons rather than declaring at 19. He could have just been coming out of school right now, and I'm sure he'd have been better off.