Cant help but read all you guys bashing each other and think, "Oh how a little knowledge can cause a world of trouble."
You guys need to just wake up and realize that there are several techniques that work. Yes, all the way to the major league level.
And anytime I hear "my 10 year old has great mechanics so he doesn't stress the elbow or shoulder" I have to laugh at how little you know about the pediatric skeletal system and anatomy.
You can't throw a ball without transfer of forces through the joints. Joints that have open growth plates on any child under 16-18. You really need to see the damage that the traction forces on the medial elbow and compressive forces at the lateral elbow can do to a growth plate.