Yes - I think you are right.
PS The 'extra learning' hours have become an issue. He ends up reading 2-3 hours a night in bed and I received an email from my son's teacher last month complaining that he has too many AR points. (What?!) She suggested that instead of making him sit and read,I should let him go outside and play!! I politely let her know that he is signed up for many different sports, goes to cub scouts and plays with neighborhood kids every day. (BTW, he is not overweight - infact he is in great shape).
I was really hoping that since she has been a gifted teacher for so many years, she would understand he is not ahead because he is sitting at home studying for hours. He just reads alot (and very quickly) and picks things up immediately. It's so frustrating to have to constantly defend yourself because your child is doing well!