Well you could factor in him not seeing JT or the 'abductor either... not noticing shutters and all that jazz.
All of which are totally understandable if only you put your thinking cap on .... and read the posts of others.
1) Not seeing JT = his back was towards her as he stood on the kerb and she passed by. The footpath was very wide at the point where Gerry and Jez were chatting. [See Amarals latest video. He is standing where Gerry was standing and there is a massive space behind him]
2) Not seeing the
'alleged' abductor (Tannerman) = Tannerman was 30 metres away and furthermore uphill. The lighting was bad.
Most important of all he was talking to Jezz and Tannerman was at right angles to his path of vision. Nobody sees things at right angles to their line of vision
3) Not noticing the shutters = Gerry did not pass the shutters when he checked the children at about 9pm.
How could he have noticed them?
Furthermore, Gerry saw Madeleine in her bed when he did his check. SY say Madekleine was abducted ... so the '
alleged abductor' had not struck at that time.
As I say, there is absolutely NO REASON why Gerry could have witnessed any of these happenings. NO CHANCE