Board Thread:FAQs/@comment-36823355-20180904194325/@comment-36823355-20180905095528

Yeah I agree with you on that, after Volume 5 it's pretty clear that Cinder isn't influenced by anything, in fact she's still the same, which actually makes her Volume 4 behavior kinda weird.

But still, if this "soul transfer" thing did happen, it would still make more sense for Amber to come back than Pyrrha in my opinion.