Just jumping off your post....
As I'm looking through these photos again of the house, it just dawned on me that a person can get a pretty good lay out of a house without ever being in it, just by viewing the realtor's pictures on line. And sometimes the pictures are more in depth/show more detail than others. So, I guess what I'm trying to say is for example, in this case, FD may have had a basic idea of the house layout even if he had never been it. I'm not saying that is the case because I don't know if he has been in it or not, but criminals could sure possibly stake out places of interest etc to get ideas from viewing realtors pictures on line of houses for sale, rent, etc. That's kind of a scary thought actually, but I do realize it is necessary for realtors to do this in their listings, but for criminal minds it could be a detriment.