JH,
Nice story.
On the flip side, when son was a freshman he was called on early and often and struggled and he was pushed to the max. Weekdays he would start, weekends he would relieve or close (in lieu of bullpen), he was so frustrated he called one night to tell us he was ready to come home!
Always allow your player to call home to vent, be supportive and listen, offer suggestions, if asked and don't be afraid to play devil's advocate. My suggestion is to remember there are two sides to every story and it's not unusual for the player to feel that coach doesn't like him or he deserves more time than those that have it. Keep in mind that often times upperclassman get the first shot until they lose it, it's just sometimes the right of passage for most. Keep in mind that someday your player will be the starter fighting to keep his spot, tell your player to be prepared for when the time comes and NEVER act like you are better than anyone else.