I don't understand what you mean by walking past the patio door to walk up and around to the car park? If they didn't enter the gate off the road they would simply take a few more steps further up the road which was uphill and turn left into the car park and effectively be facing the front door?
So I can understand the thinking about not using the front door door which opening and closing may have disturbed the children but if GM simply listened at the window this would nullify the reason for not using the front door? He may not have done this at all or on all occasions but on his 9pm ish check he was in some hurry to get back to the table for his food and he was also delayed by his conversation with JW. I'm thinking he may well have met JW before checking the twins and then taken a shortcut on his checking by simply listening at the window. The fact he might have been in a slightly different location might account for the fact JT saw him but he didn't see her. Others might then have realised this was the case and then sort of effectively covered for him.
All concerned seemed reluctant to take part in a reconstruction which to my mind seems odd.
Somebody timed that detour, it's about 50 seconds or so, but I'm sure a virile, tennis player could vault the wall and do it quicker.
There's some sense in the 'do not disturb' thing, to the point where I actually think Gerry went for a wazz in the bushes - I would - he was bursting apparently.
If the accounts are to be believed, then he told Matthew Oldfield (this opens a whole other echelon of this case, as there's a branch of sceptics who think MM died earlier in the week, so that would mean Matthew Oldfield was aware of this, as he would potentially find 2 instead of 3 wee ans) to go through the patio doors to check, for the 'don't disturb' reason - OK. But then he states the following night, the 4th, that he entered through the front door.