it is very common in my area for kids who are struggling academically and late bloomers to repeat 7th grade when changing from public to private schools to get them back on track. Also, these days, kids born after September are often held back from starting Kindergarten so they don’t have to be the youngest kids in their class or because they aren’t quite ready to make the jump. To call these kids cheaters seems a bit over the top. I don’t know Miller’s specifics but someone said he is an October birthday so it isn’t even a real advantage over the early year birthdays anyways.