I agree that the timeline and physical checks being claimed are made up for effect.IMO.
The time line was scrutinised and seen to be at odds with a reality scenario. Tanner walking past Gerry seeing Tanner man who just happened to jemmie a shutter, open a window when daddy was in the flat, and just left- shear fantasy. This is what kills the abduction theory.
There is nothing wrong in thinking MBM came to harm just before or just after the parents left.
A hiding place? as has been mentioned the body could have been moved several times. A Little girls body was hidden in a loft in the UK by step dad-and then moved.
So everyone lied about physically checking on their children? Well that can't be said about Jane and Russell their child was ill and they took it in turns to check her. You need everyone to be lying so that they are all guilty, solves having to debate about the case doesn't it.
If Gerry had been talking to Jeremy looking down the road rather than across to the pavement area, then yes Jane could easily have walked past them when they were engrossed in conversation. I've walked straight past family members who have been talking and they haven't seen me but I have seen them. Jemmy a shutter? Well its you who is saying that, I say it was opened from inside, but there you go. A man managed to get into apartments even though the apartments were locked, assaulted children with the parents in the apartment at the time. So how do you find it a fantasy that the abductor could have been in the apartment when Gerry entered it? Personally, I think the abductor slipped back out through the front door having been warned by an accomplice when Gerry entered the apartment, opened the window after Gerry left, so what do you say about that?