"Sure, you can give me more bloodline abilities than Faluel, but you can't give me the most precious of her gifts: trust and loyalty. Back when Lith hid a crapton of secrets, Faluel could have blackmailed his ass into oblivion, but she never did.
"Faluel did more than teach us magic. She protected us, our families, and our secrets, no matter how stupid they might seem to you." Friya couldn't mention Nalrond, since his knowledge of the Fringes was still dangerous, but she thought of him no less than Lith.
Faluel might have forced the Rezar instead of bargaining with him to teach her Light Mastery. She could have extorted his bloodline legacy from him and everything he knew about the Fringe he came from, yet the Hydra had never abused her position of superiority.
Even when it would have been most convenient for her.