Adam, do you remember Ed Lopat? He was one of the greatest strategic pitchers in the history of the game, not much speed but he threw everything else, including the kitchen sink, and he had the control to go with it (the sportswriters used to say about him that he was wild if he walked more than two in a game). He doubled as an additional pitching coach for the Yanks, and he was ready and willing to work with anyone who was interested, who really wanted to know, and who was willing to work at it---be it Little Leaguer, teammate, pitchers on other clubs who needed some advice, or just someone like me who was pretty good but who wanted to be more effective on the mound. What I learned from him in the three-plus years we worked together was nothing short of priceless.
And all these decades it has stayed with me. 8)