Good question, because it's ultimately about specific relationships of muscles and bones.
Oswalt definitely is 'long in back.' However, I think Chris misses the boat on this in terms of biomechanical issues, because the critical reference point is hand position when a pitcher is 'long in the back.' From frames 27-29 you can clearly see the hand position start on top of the ball, then the forearm pronates to face the ball to first base.
This is a big problem. In order to throw a pitch with active pronation of the forearm, if the forearm is already pronated, you can't simply pronate more. The only forearm action now possible at these high speeds is supination. Ultimately the act of hooking the ball the way Oswalt does will result in posterior elbow damage. In frame 35 his elbow has already, milliseconds earlier, hyperextended.
To protect the back/posterior of his elbow at pitch release, he needs to start turning the ball over, showing it to third base (or better yet palm facing skyward), by frame 26 or 27. The fact that he is 'long in back' does protect the UCL and front of the shoulder to a degree because in minimizes the distance his forearm bounces back, roughly at frame 34. If I were in the business of predicting, which I'm not, I would offer that he will end up with bone chips/spurs and cartilage damage in the posterior elbow in addition to decreased elbow range of motion.