And basically it is a numbers game... CESA enjoys high turn out in their system and are able to field multiple teams for an age group. And to their credit they have always stayed with the Premier and challenge team labels in the challenge league and the classic label in the classic league.
Bridge on the other hand has stated from the beginning (see bear or bridge posts in the past) that they will only field Challenge level teams (and I believe the max was 2) per age group. So if the numbers are there they would field a team (presumably the talent is there as well)
Many other clubs with multiple teams in an age group usually have 1 representative in Classic and one in Challenge.
Also in the younger ages, it is common practice (I do not know why) that a team plays classic in the fall and Challenge in the spring
