That would be an even easier lie to see through and be at odd with the other things he was trying to convince her of as there were always forsaken that didn’t see eye to eye or go along with her and if your whole faction could get sent to the afterlife due to agreeing with the actions of your leader tons of family’s would togather and there would be no problem with how the arbiter was doing things.
All of the forsaken going to the maw just isn’t a thing for why she joined the jailer.