Just watched the Disappeared episode about Steven. My initial feeling is that he was in that neighborhood for an appointment, and met with foul play at the address he went to.
He parked in that cul-de-sac, and his final destination was one of the nearby homes.
I will be reading through the thread tonight, but my first thought is whether LE has searched/interviewed the households in that section of the development.
Understanding that search warrants may be necessary, I would think many of the dwellings have not been thoroughly examined.
Steven met his demise IMHO at a location nearby, walking distance from his last known sighting in the video surveillance tape.