The elite pitchers everyone refers to would not come to Ernie Parker to take some one-on-one lessons for anything you are going to see on any of his videos. They will meet with him for 'fine tuning' something they do to make it even better than it is. He has a long time proven track record of doing just that.
When I was instructing, there were some things I would teach a 14u pitcher that I would NOT teach an 8 year old beginner. Things I would teach a college or international level pitcher that I would not teach a 14u pitcher. Especially when it came to how they should think and the mechanics the older and stronger pitchers could handle.
There are a handfulof things I would teach a pitcher if I worked with them personally that are not in my book. Trying to put those things down in print never came out correctly or was understood well at all, it had to be taught in person and demonstrated. I am sure Ernie has some teaching methods he uses in person that he had trouble getting across on a video and they never got on a video.
Don't make the mistake of selling Ernie or his videos short. They are great for the pitchers at the levels they are intended for.