This is going to sound a little strange, I know as I don't think my explanation of my thought process is going to sound coherent
I was on Google Maps looking at Beechdale Rd etc trying to get a visual on the area ( I'm not from the States, so I had a lovely time!) and trying to find where cameras may have been located (it was before the post with the camera hidden in a windmill type thing), anyway, I got to about 570 Beechdale I think, and I noticed a red car parked up ( I am
not saying its JS' vehicle - it was the colour of vehicle that made me think)- if LS wasn't familiar with vehicle models but regularly saw a vehicle of same colour/similar shape on her walk home - she wouldn't necessarily think twice about another car if it looked like the one that was familiar - this probably makes no sense - so I apologize for that, maybe he was able to park up and watch her regularly without her noticing?