But if they formed their own link some of their programmed desire for their people might be satisfied so that when they saw their origin world they no longer uncontrollably wanted to blend with it but instead just fancied it somewhat. And perhaps their resentment at being abandoned and their distrust of their people would not be over ridden. They were getting what they most needed from their mini link so they had clearer heads.
This might be why they didn't send them out by twos or threes, not just because they would learn more if they knew nothing of who they were. But because it would interfere with their programming.