When I was still a team coach, we had a couple players that utilized private instructors for either pitching or hitting. I had regular conversations with these players during practice so that I could better understand their approach. Not to change anything, but so that I could better help them when their instructor was not there (games and practice). If they were struggling with something, I would ask "what does coach x suggest in this situation?" If they were unsure, I would explain what I am seeing and ask them to speak with their instructor about it during their next session. I would not personally seek out their instructors, but I was also not opposed to speaking with them if they were interested. I just didn't see it as my place. I would tell the player (or parent) that I would be willing to share notes if the instructor wanted to talk to me. One particular instructor taught at the same facility I did, so we talked often. Our theories are very close so we would often talk after lessons.
Oftentimes the biggest impediment to learning is ego.
Oftentimes the biggest impediment to learning is ego.