He tore his achilles (not ACL) a few years back, that certainly didn't help. But he didn't have a lot of lift before that either, he needs speed to get some vertical. He also not as strong as most NBA fours, he easily gets pushed around at the hoop. So with Jonas, what you see is what you get. A tweener who hustles and gives 100% every night, plays some defense, pump fakes too much but knocks down an occasional 3.