This is why it matters at in youth. Try to keep up. Assume all kids are the same age and a 2023 team has 23 spots. Fair competition. Now assume 5-10 snowflakes do an extra year of school. They have an unfair advantage for the 2023 team. Now let’s look at high school. Assume on age kids for 9-12 grade for say 30 spots for V and 30 for JV. Fair competition. But now assume 5-10 kids each grade have done an extra year of school. Fair competition. Even you ha,mere heads can see the holdbacks now in 12th grade should have graduated, and those in 10th should be in 11th therefore ineligible for JV.