I hope to have something up some time in November.

For simplicity's sake, let's talk about weakness in the triceps. The triceps is definitely part of the kinetic chain used in a bench press. If this muscle is weak, say after a certain number of reps or because of a contusion, what happens? Do the other muscles face added stress or does the kinetic chain simply weaken?

The answer should be obvious. The muscles are under the same stress as they were during the very first rep, but now, the triceps is too weak to continue. Instead of being able to complete the rep, the kinetic energy created by the chain fails to lift the weight.

This is perfectly analogous to pitching - a repetitive exercise in which the stress levels are roughly the same repetition after repetition (not accounting for pitch types). When a single muscle or group in the chain weakens, the entire chain weakens.

This is why the study looked at all throwing-related surgeries instead of just shoulder injuries. A weak rotator cuff could conceivably cause elbow trouble because the kinetic chain has become weaker as a whole and is no longer efficiently decelerating the arm.

I think you may have also misunderstood the point of this article. This article is not an argument that super strong rotator cuffs prevent all pitching injuries. Not even close.

This article argues that a weak rotator cuff is obviously a giant red flag for throwing-related injuries and that a study was not necessary to prove it.

The exercises mimic Dr. Marshall's throwing motion. None of his pitchers have suffered an injury resulting from his training methods. His methods are designed as much to prevent injury as they are to improve velocity.

Exercises like these are misunderstood by most people who see them because they do not understand what they are seeing.

As for your rotator cuff injury, I doubt that this exercise had anything to do with it. Your rotator cuff is minimally involved with acceleration. Almost every pitching-related rotator cuff injury is the result of a deceleration problem (after the weight has left your hand).

Improper use of weights like these is far more likely to result in a problem with the glenoid labrum or the anterior shoulder capsule.