Can also be interesting to look at instructors by recruit.

In other words, it's common for players to move through instructors as they age and progress. Probably best example is in the pitching world... common for 14U and lower to be working with lots of "semi-pro" pitching coaches (eg, it's a side hustle in a pop-up garage) and then - if they're on a college track - moving on to groups like OGX or BSF to work with the latest technology and techniques.