OK, I understand combined age bands after puberty -- the level of play isn't as age-dependent when you are looking at girls that are 15 and 16 years old. But when you are talking about girls that are 11, 12 and 13, there is a HUGE difference between the average top competitive athlete at age 13 and the same athlete at 11 or 12. A middle-of-the road player on the top competitive team 2005 can often beat out the top of the 2006. Maturity, size, speed often plays a big part of that.
Obviously, if you are comparing a player on a lower level 2005 team, that is different, but I am talking about the top players in the 2005 and 2006 age group at a top club.
So how many 2006 players will these top DA teams really put on their roster? Oh wait, I forgot -- its about development. So does that mean a promising 2005 is kicked from the DA roster for a 2006 to get on and "develop?" Then you put the 2005 back on the next year when it goes to single age again? What a disaster...