I've adopted a few orphaned Open profiles that represented living (or possibly living) people but didn't have dates. After adopting them, I could add their date information and continue adding data, even after the profile became Unlisted. But once I discover they are still living (or possibly still living), I feel like I can't give up the profile manager slot, because that would cause the person to become an invisible zombie that no one can see or edit... I'm hoping for relatives to show up to claim them!