[Except... if they changed too much, would they still even be useful? It's a thought he's had, seeing how there are other fully changed monsters that aren't being used in sacrifice. Because they're unsuitable?]

I was with Jayce during his third experiment. I happened to come across him beyond the safety of the shields. His mental state was as... disconcerting as his report suggests.

[Jayce's report had stated insistent and focused monster attacks until sunrise.]

But my concern is that he came under attack by the monsters. The monsters targetted him and only him, despite my presence on the field. No matter how many I cut down, or if I put myself between Jayce and the monsters, they would ignore me completely in favour of attacking Jayce.