When you entered the dark cave and smashed Trompdoy's soul jar, there are the other three (+ Gratiana's), you can pick them up even without starting their quest (same goes for the priestes), when you meet them in the maze, you can tell them, that you already have their soul jars and it should bypass the persuation check, I guess. Then simply destroy the jars one by one from your inventory to free these guys (don't do that with Gratiana's, she wants to absorb her soul herself, just hand it over and all quests done).
