look for exercises that emphasize a throwing motion for more power there (such as grabbing a medicine ball with both hands and making the body motion)…[/quote]
No offensive man, but that’s an ineffective, and potentially dangerous, idea.
Cosgrove, Cressey, Robertson and others have all used a similar analogy for this situation; If a baseball player came to them, the first thing they would do is train the opposing throwing muscles (like the biceps and upper back), and the absolute last thing they would do is to mimic the actual throwing motion against resistance. This advice is 100% spot-on.
If you were to work these same muscles in the weight room, they’d quickly get overtrained, and it would only encourage muscle imbalances (which lead to injury). I dare you to keep track of how many “reps” of throws you do during your next practice or game. You’ll lose count for sure. Anatomically, the muscles that are supposed to balance these throwing muscles need just as much attention, if not more.
So, unless your league is using an 8-pound baseball, there’s no point in training with resistance that way. Use the weight room for building a stronger and faster body, then use time on the field in practice to translate that strength and speed for the game.
Just as important as the rotator cuff/shoulder/scapula area is the hips, abs (core), and grip. A weak point in any of those three, and it doesn’t matter if your shoulder is super-healthy.