With Wentz, I suspect that there was some sort of mental issue that resulted from the injury. Maybe some sort of fear of getting hurt again that impacted his reaction times and decision making. A torn ACL hurts like a motherfucker and depending on someone's pain tolerance, it could easily cause some sort of anxiety disorder. There are plenty of supremely talented athletes that struggle due to something mental rather than physical (Ben Simmons in the NBA is another example)