I obviously don`t know, but from playing in outside-of-school sports when I were a lad, every year the authority body would change rules, rejig leagues, become strict on something silly, and maybe in this case change the ages for kids to perform in certain leagues or something. Then u can find half of u`r team qualify for 1 and the rest split between another 2, hence messing up the tight knit team u had. Oh and give u like 2 weeks to submit paperwork for stuff.
Anyone who knows about collecting paperwork, passport photos and signitures for anything up to 20 kids who u may see 3 times in two weeks if u`r lucky, will know that`s pretty difficult. And they usually want a fee.
Screws many a team up every year, splits them about, and some kids/coaches don`t move onto anything cos mostly they just want to play and not mess about.
Might be all wrong tho.