The homeless man now in 2 episodes

The guy that went up to Casey at the church when they were feeding the homeless (same guy that was outside the church on episode 1), said in Latin: Lupus in fabula venit enim ad me. That translates to "The wolf in the story/fable: he came to me too." Maybe he was possessed by the same demon, but found Casey to be a better host.

Her family is probably going to be around the Pope, so it makes more sense to go to a girl from a wealthy/influential family than to just a homeless man. Although, we know from the first episode that there are many demons in this area, from the line about the rats - "Where there is one, there are many."