But that's the whole point. The abductor and/or his accomplice were not to know that Gerry McCann would pause outside the apartment to chat or that Jane Tanner would choose that moment to visit her own apartment. Sorry about the pun but the window of opportunity was never going to be ideal thus why they decided to go for it the moment Gerry left the apartment.
The alternative scenario of course is that the abductor was already in the apartment when Gerry arrived at about 9.12pm having chosen to make his move after observing Matthew do his rounds at 9pm. Support for this comes in the form of the opened bedroom door which Gerry closed to within 10cm before leaving the apartment.
So the bottom line is this, if the opened bedroom door signified the presence of an intruder and Gerry actually saw Madeleine in her bed then the abductor must have been there hiding.
But wouldn't the abductor have heard Gerry & Jez talking in the street? It would have been silent in the apartment.
Then when he got out of the apartment and heard voices on the road why did he decide to walk across the very road he would have heard the child's father talking on?
That makes no sense as the risk is massive to the abductor.
He'd have surely heard the talking and bailed the other way across the complex and behind the complex wall.
Also if he could get in and out so quick why would he need to get out within minutes of Gerry leaving? If they were being watched he would know the checks were being done every 20-30 minutes, he could have waited 10 minutes and then make a break for it.
It doesn't make sense that he set off whilst he heard people talking on the street and it makes no sense to walk across that very street and potentially be exposed to the child's father seeing him.
Unless of course, which makes more sense, given both Gerry and Jez are adamant they saw no one, and Jane said she walked past both men who were in fact on the other side of the road, there was no man walking across the road.