human...you're over thinking it. a person cannot see from Tom Thumb to the DR driveway. that's not the point. the point is a perp in a car hanging around the Tom Thumb trolling could have seen the boys turning east off 16th and made the assumption they would head back south on 16th. Of course, if the perp did not know who the boys were then the assumption could be wrong as the perp wouldn't know which neighborhood they actually came from. however, given the reports from residents of the community in the weeks before the abduction, suspicious cars were noticed in various locations on 90th + 91st (16th) avenues so it's reasonable to theorize that the people in these cars could have been at Tom Thumb or on one of the streets and observed the boys on their way to the store.
Before DR, there were several homes close together. Close in terms of country, not city. Can't remember how many. Then a ling way of nothing until DR.
I do not know where Aaron lived. Does anyone?