Thing is we don’t know how much of their past selves they’d retain. Low level fallen like dregs and vandals are easily manipulated on top of the horrible changes that occur. But high level fallen like kells and archons are a different can of worms. Fikrul was an Archon Priest and he remembers everything about his past.
It would all depend on how much of their former identity they retain.
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Fikrul can convince almost an entire army, a couple more who died, and he has complete leverage since he raised them from the dead