I think we're right about the daughter, and I don't think Hart or Rust will ever figure it out. We have knowledge the characters don't have because we're Eternity or whatnot, remember?
It could very well end showing us the people who get away with it as a tease - Maggie, the father in law, the black cops, the guy who owns the bar Rusts works at, Lester from the Wire who was in the show for two minutes, the mailman, and Daddario's left boob. And there's strong evidence against her other boob, too. I've played that scene over and over and something just doesn't add up.