I have no idea what I'm going to do with the Red Fledglings in the NoHoper series. I'm sure the Casts wrote them in as a way to bring back Stevie Rae and it snowballed from there, but the whole fact that they exist breaks the world they built and cheapens their own rules and sense of threat in the plot. Why does it matter if a fledgling rejects the Change, even if they're going to come back different, because they're coming back anyway?
That's one thing, but I'm so sure the Casts don't really know why Neferet would conceivably make a standing army of undead that she cannot actually control; the stated reason seems to be having a standing army, when it seems the more likely reason, from the brain of the mastermind who would kill professors to radicalise her school and the vampyre world at large against humans, would be manufacturing anti-vampyre sentiment when they inevitably went rogue in their pursuit of blood.
Like, I get why they made sense for the Casts' plot in the short-term, but in the long term, they simply break it, and they don't do us the decency of really making sense -- especially because their "undead" qualities were *so fucking easy* to neutralise with the elements! Call me crazy, but I don't think there's anything wrong with having the walking undead in a story - only in making it so easy to make them "living" again, and in a way that undermines your story.