Where did he hide ? If he was disturbed by Gerry he would in all probability have been in the children's bedroom and the first thing he would have known was Gerry opening the patio doors. From where Gerry would have been standing there is a direct line of sight to the children's bedroom so he couldn't have left the bedroom and we know from Amaral's documentary that it was virtually impossible to hide in the bedroom so where did he conceal himself ?
I can understand why they would have wondered:
- the narrow window of opportunity;
- the bedroom door being more open than usual.
I find it unlikely that someone could have been hiding in the children's bedroom:
- there may well not have been space to hide behind the door;
- getting into the wardrobe may not have been feasible depending on how much space there actually was between the right-hand cot and the wardrobe;
- there may (or not) have been enough space to crouch and hide at the far right-hand corner, near the chair;
- it would have required total silence.
On the other hand, if there had been someone in there, the first noise would quite possibly be the gate. It would have been risky to hide in the parents' bedroom (in case someone decided to get an extra layer of clothing or something else), but less risky than hiding anywhere else.