What Maria da Silva could see, or could not see, strikes me as important.
As far as I am aware, she is the one and only witness to describe the surroundings to the front of block 5 around the time Madeleine disappeared. (Please correct me if I am wrong because, trust me, I would like to have more info on what was going on in this area at that time.)
The watchers from the T9 come and go. What do I learn from this? Pretty much close to zero. Matthew says he checked 5B around 9:30. Whether the shutter on 5A was up or down is critical, and what we get is .... zip. He checked inside 5A. His info says the shutter might have been up. Or then again it might have been down. The others do their checks, and what I know about what was happening in the car park of 5A, and around the sole entrance point to 5A is ....... zip.
Let me move on to Kate's book. When she checked around 10, Madeleine was gone, and Kate came to a rapid conclusion that the child had been abducted, with the open bedroom window a likely point of entry, exit or something else. So she went to the window and looked out, thus explaining her fingerprints on it.
Fine so far, but what did she see? Given that, at this point, she was thinking along the lines of an abductor to the front of 5A? At this point her statements and the book give us ........ zip.
There is no tale of an empty car park, a deserted street, an absence of movement or ....... anything. That view has to be ultra-important, yet I have no idea what Kate saw, or did not see. Because it is not described.
Now I have to role-play a mother who thinks her child has been snatched and is somewhere to the front of 5A. What route does my acting take me? Out of the front of 5A, probably into the car park, quite possibly to the car park entrance for a quick look left and right on that street to find out if Madeleine is still there.
Please do not get too hooked-up on my role-play. Kate did do, or didn't do, that which she did, or didn't, so my role-play is trivial.
HOWEVER, the facts of the matter are these.
From the point on the graphic that I posted earlier, Kate could see people walking on the street in front of 5A. She could see cars moving in front of 5A. And as she went up the hill to enter 5A for her 10:00 check, she could see the rest of the vicinity.
There were checkers a-plenty criss-crossing the front of 5A (and the rear).
What do I know about the front of 5A around the time when the alarm was raised? Maria da Silva reckons there was light from the block above the level of the McCanns, but she does not know where, and there was a small grey car in the car park.
This is not a lot really, given the number of statements. And the books.