A catcher is in the best position to see what's working and what isn't on any given day. If he is astute enough to see a difference in delivery (anything from foot position to release point), he can talk to the pitcher about it.
Of course, there are more questions --- they may be in the bullpen, but is the pitcher warming up to go into a crucial game? What is the psychology of that pitcher? Is the coach coaching in the bullpen as well (too many cooks)? Is it a Lefty
?In-game, a minor adjustment might be discussed. But have your catcher think about it this way --- would he want the coach or the on-deck batter requesting time in the middle of one of his at bats to make a major adjust his swing?
Much of what goes on on the mound during a game is and should be between the ears --- pitcher support, ego adjustment, off-color jokes for relaxation, what to get Millie & Jimmy for a wedding present. Or threats and bribes (Recently my son, after being repeatedly shaken off by a pitcher not having a good day, went out to the mound to tell his pitcher "You will throw this guy your curve in the dirt. Nothing else. If he does not strike out on that pitch, I will pay you $50. Pitch thrown, K, money saved.)
Your catcher just doesn't want to get the old Gibby line to McCarver when he was trotting himself out to the mound: "Get back behind the plate; the only thing you know about pitching is that it's hard to hit!"
