This is the suggestions box still, so I guess my suggestion here would be to increase plot relevance in the future companions or something?? Might be too hard at this point in the writing process, who knows.
My impression when I realized the types of stories that I was hearing and the details of the tadpole's specialness was that everyone was handpicked based on what they had done, sort of as if the Illithids had decided who SHOULD be running things and we were it. I imagine that we even find that our custom made character has a backstory that we discover when we get to that part of the game - our own baggage.