His best hope is that playing beside Westbrook inspires him to improve drastically like it did for Oladipo, because he's never been efficient even when the Hawks had good teams. He's not a good enough finisher around the rim and struggles to get to the free throw line. Mix that with average at best shooting and you have a guy who is just not efficient.
Now mix that with poor playmaking ability, a bad attitude, and a lack of defense and you have a guy that should not be considered "really good." A really good backup perhaps.