You should have divided the slots between all ranks starting from Jr. member to Legendary members. And if you were already planning not to accept anyone below Full members then you shouldn't have announced it with Jr. member and above signatures. I think it is unfair.
Well they have the rights to accept people from the ranks where they can get more impressions. A legendary rank signature space can hold their banner while jr. ranks are limited to a one liner link without designs. I thinks it's fair for them to choose where they will get more interests.