Got to go with bbscout.
In my son's case he never called the pitch The catcher always called the game and the coach would call some of the pitches. My son never called a pitch off which I tried to get him to do on a rare occasion. He also used the catcher's body to throw to. The catcher who often threw his glove out to tell him where he wanted it but he usually pulled it back until the pitch was delivered.
To me the catcher would be the only one who could really tell you if he is hitting his spots. many of my son's curve balls hit the dirt in front of the plate. Lots of people call that not hitting your spot but that is where he wants it. One coach we had used to tell the pitchers if they threw a strike on a low ball count for the 3rd strike he would bench you. A lot of people don't realize this.
The catcher is the only one who knows.