Long time ago a local school had a kid who ran track and played baseball. Baseball team was and still is a state power, kid did just the long jump (I believe) was very good, he also was a good baseball player. At my local school had a football player who missed several varsity games because he played for a "club" hockey team. One of the games he missed was against one of the top teams in the league (sat the next game). Moral of the story if you are a stud, coaches may make exceptions to the rules.
- Had a kid on the baseball team HJ for the track team one year while I was in HS. It helped that his dad was the throwing coach. Otherwise, the head track coach was an "all or nothing" kind of guy. He once kicked guys off the team who missed a practice after donating blood at the school's annual spring blood drive.
- Had a girl who was a softball pitcher LJ a few years ago. She LJed in more meets than she attended track practices (3 to 1).
- The creme de la creme was a sprinter who was also CF on the baseball team. Made state in track his frosh year in the 100. He did not run the track postseason his soph. year since district prelims conflicted with the baseball team's district tournament. He also missed a lot of practices and other meets due to baseball games which created resentment among some of his track teammates that spilled over into the following season and affected choices some of his teammates made that season. Junior year, he ran the 100 at state in track, then played a baseball state semifinal later that day. Ran the finals in track the next day and finished 2nd then played in the baseball state championship game that night and won. His senior year, he avoided a major conflict when the baseball team lost in the regional semifinals. Had they won, he'd have been choosing between either playing the baseball regional final the next day or running in the track regional finals. He won the 100 and anchored both the 4x200 and 4x100 to wins at the regional. IIRC, he attended maybe 1 track practice the last month of his senior year. In addition to baseball, he was nursing a quad injury which he reaggravated at state in the 100m final. He was a great kid (athletic and an eventual Princeton grad) but overextended himself, IMHO. It also didn't help that some of the adults involved in the situation had misconceptions about how sharing the kid's services would look, i.e. it was nowhere near a 50/50 split, and nor should it be, IMHO. It was entertaining attending meets his last years and being inundated with questions from other coaches asking if the kid was racing today and if he would be racing in the postseason.
- A rival school had some guys compete in the track postseason after early exits from their baseball and tennis postseasons. Those guys scored points in the jumps to help the team win yet another district title. I assume the coach included their names on the eligibility certificate, so it was all good.
To the bolded part: If you are deemed irreplaceable, you get a much longer leash in life from those who hold you in that regard.