If FM's timelines are correct, at least 25 minutes before police were called.. the Crabbes out and about, HS leaving for bingo, FD arriving back home from Lakewood, PS supposedly sitting on his deck watching everything, AMS standing/sitting outside periodically having a smoke, lawnmower man mowing the lawn.. nobody saw a thing. Seems impossible if someone took him on foot, imho. I could see possibly not making anything of it at the time (although even that would be difficult to understand), but even in hindsight, no neighbours saw anything? How fast can a 70-something year old man walk lugging a 3 year old and trying to keep him silent and without being seen?
ETA: to add that according to FM, she also took a drive, as well as walked the roads, so she was on the lookout as well.. not sure if before or after she called 000.