Though it shouldn't be the WHL draft is top heavy with players born from January to June
by N. W. Bruin
It has to do with older guys being more developed than younger players even though a few months difference. If everything was even you should see 50%/50% split between the first half of the year compared to the last half. A large group of the listed players come from the second half of the year birthdays. Of course there is also a large amount from the first half who get just listed too but it is one reason among others for listed players.