TBH, dude wasn't used to playing against taller defenders. But This cat is still young and has time to develop. We're looking at potentially the next gerald green in the making...
He's not going to grow, he's already 23 and the best you can hope for from him is just being a rotational player. He was supposed to be the most NBA ready player taken in the draft, and if he's this far behind the curve already then it's not a good look. Gerald Green was a HS player when he was drafted, his long development is kind of understandable, Robinson's really isn't.
There's nothing there that makes me think he'll be any better than a JJ Hickson type at best.