It seems implausible that Lou Solverson had never seen the photos of Lorne Malvo in the year before he showed up in his coffee shop. Molly was obsessed with the case, and her diagram of the crimes at home and at her office both included the photos of him, including the clear headshot of him posing as preacher Frank Peterson. It seems very likely that Molly would have consulted with him on the case, especially considering that one of the reasons Gus apparently lost his job was over his supposed wrongful arrest of Frank Peterson aka Malvo. See more
Look, you can't... that's just how it is, sometimes. Life. You know, you go to bed unsatisfied. They're calling the lottery numbers on the tv and you get the first few and already in your mind you're buying a jet or a fjord or whatever, but it's just not meant to be. It's just not meant to be.