What you put into it
Bill Hillhouse has a great article up on his Web site about pitchers and pitching coaches. One of the important points he makes is that there are players who want to say they go to “so-and-so” pitching coach, but they never put in the work to learn how to actually learn how to pitch.
While it’s important to go to a good, knowledgeable coach, it’s not enough. You have to be willing to put in the work and do what the coach tells you, because you’re the one who will be in the circle when the pressure is on. In other words, it doesn’t matter how much the coach knows. It only matters if you follow what he/she says. Even the best pitching coaches can’t do it for you.
Parents have a part in this too. If you’re paying good money for a pitching coach, make sure you get the value out of it. Listen to what he/she says and make sure your player is following that advice and working at the right things. Otherwise you’re just throwing your money and time away.