Thanks for the chapter!
If you're gonna love the Devil, it doesn't hurt to forsake your humanity.
The loophole is that you're going to Hell anyway, it's kind of a win-win scenario.
The people Adrian killed were ones that were going to die already and I believe they received compensation for their deaths (there was that notebook listing the date of killing/compensation paid)
Hilda basically assigned Rosie (literal demon child) to find 'assistants' aka sacrificial pawns she can call over to murder in emergencies.
Like right now.
No, they're new people she sent the demon child to gather (ch 52) the first two are initially mentioned in ch 55 when she checked the window.
The two og lackeys are Cayden and Grover (technically Emily was added to the 'charm' list before them, but Hilda's not gonna kill her friend...except that one time she almost did)