I think, from that which was in the text, that Ari I meant to leave Justin fixed on Ari (I, II, however many) and on his own work (two points, stability in relation) to counter the influence on her work that her uncles would have. That he also is conscience I do not think was necessarily intended. If Ari II were as ruthless as her predecessor, she would have entirely consumed a broken Justin and spat out the pieces. I think her design for him was to leave him jaded and cynical and with a wing of his own, working on his own design work, in a position of power able and willing to hold his own in the face of the Nyes.

I think she wanted a pet-tempermented version of Jordan, only on her side and under her control.