Do we know the order of the places Gerry went in 5A? Because it might just have been possible that Gerry used the loo first, then an abductor would have had time to move out of Madeleines bedroom and hide, say, in the kitchen.
Risky ! Phwew !
Assuming that nothing was lost in translation, Gerry never went into the parents' bedroom - children's room first, bathroom second.
http://www.mccannpjfiles.co.uk/PJ/GERRY-MCCANN-10MAY.htmsnipped
He followed the normal route up to the rear door, which being open he only had to move [slide] it, that being the way in which he entered [was entering] the lounge, he noted that the children's bedroom door was not ajar as he had left it but half-way open, which he thought strange, having then put together the thought of MADELEINE having got up to go to sleep in his bedroom so as to avoid the noise produced [created] by her siblings. In this way he entered the children's bedroom and established visual contact with each of them, checking and is certain of this, that the three were sleeping deeply. He left the children's bedroom returning to place the door how he had already previously described, [then] going to the bathroom. Everything else was normal, the blinds, curtains and windows closed, very dark, there only being the light that came from the lounge.
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He adds that he never entered any other part of the residence [his bedroom or the kitchen] where he was for only two or three minutes, leaving yet again through the rear door that he closed but did not lock. He clarifies that he returned without seeing the children of any other family because he had not been asked to by them