Yeah, see. I don't think it is. Originally, only Ed's tadpole escaped the body and fled. Then, in later patches, they added massive tadpoles fleeing from dead True Souls, implying that this was a normal for True Souls. However, never once does a tadpole escape from you. Yes, indeed. Something is truly different about yours.
And again, that's why everyone, including Raphael, wants you. Something about you is different from the others. Yes, if you got to Moonrise, they might have been able to complete your "training" so to speak, and you'd have been brainwashed like other True Souls, but I think you are still definitely unique. Even if you'd made it to Moonrise, I think you'd have been only similar to other True Souls in that you'd have been brainwashed and unable to choose for yourself. I still think you'd be very powerful; moreso than the others.
Notice that Minthara and Glut and Ragzlin don't use illithid powers like Survival Instinct or Reflection or whatever. Those powers only belong to you.