>>281572857
Here's in idea. Quanxi has those dead fiends whos bodies she wants back, but she might also look for a way to bring them back to life. If Quanxi sees Death devil as a means to bring her four girls back from the dead, she might betray Yoshida and PS and join Death and Denji.
Personally I'd find that writing choice very good and interesting. Personal family reasons come first.