I do like this idea. I have been thinking for awhile now that the Illithid made some sort of demonic bargain to create the tadpoles but I could not theory craft what there end goal might be. That could explain why they went into Avernus to make a deal so that they could rise back into power. I do have some question of there motives, not every god would want to help them. Maybe they are trying to create an avatar for there god Ilsensine?
Pretty sure that he dipped into Avernus because he knew the devils would attack the githyanki and he hoped to lose them there. Reeks of evasive action rather than anything else.
It does kinda smell of evasion, but the thread itself asks "why are the tadpoles sexy". I do not see sexy tadpoles as a very mind flayer trope, more of a succubus demon kid of thing. Also the powers they are given are class specific, what they desire most. With a huge story progression around devils something tells me they main devil is not just there to "help" you. It's almost as if they made a deal for the souls of the tadpoles but they still need your consent. As for motive, mindflayer powers might just tip the blood wars in there favor.
