I always feel solving how Jane Tanner can see Jez and Gerry but they don't see Jane will give us the solution to the MM mystery.
I have seen a scientific test where a man in a gorilla suit walks through a game and no one notices it.
http://www.dailymail.co.uk/sciencetech/article-1378228/Didnt-spot-dancing-gorilla-famous-YouTube-video.html play the video and see if you see the gorilla?
https://www.youtube.com/watch?v=vJG698U2Mvo
Ok
1) From The Carpenters statements we know that there were a number of vehicles parked to the north of the Tapas Reception
2) We have worked out in previous threads from statements that Gerry was standing on the kerb of the western pavement of Rua Dr Francisco G Martins ... more or less at the entrance to the alleyway that runs between block 5 and the Tapas area. He was looking away from anyone walking up the pavement behind him.
3) Jez was standing in the road close to where it meets the kerb, opposite to Gerry. Little traffic there but for safeties sake with his little one in the pushchair, he presumably tucked in close to a parked vehicle .... blocking a good deal of his vision, left and right
4) Jane passes. Somewhere in the statements (I think) she has made it plain that she doesn't care for Gerry too much. Because Gerry is at the entrance to the alleyway and he is right on the kerb, she circles round him a good metre or so behind and as quietly as is possible*** and quietly continues up the road. It is between street lamps and quite dark.
Jane is not looking her usual attractive self, dressed in an overwhelmingly large, almost certainly dark parka / fleece belonging to Russell who is, I think, about 6'4" tall. She was cold. An amorphous shape and quite possibly with a hood up.
Please correct me if I am wrong on the height of Russell..
She is the partner to Russell, a consultant, and also has a good position herself, so not short of money. *** Her so called flip-flops could be very expensive evening sandals which do not SLAP on the ground, but are like ordinary sandals sound wise. The sound is not extra ordinary in any way.
Gerry has his back to her, he does not notice her.
Jez has a very small window to see her, because of parked vehicles and also Gerrys large frame in front of him ... and is in any case talking lovingly about his little one looking down at him. He doesn't know Jane and frankly there was nothing about her in Russells parka to make him notice her. He doesn't notice her. She doesn't even register in his brain.
About three years ago Heriberto Janosch gave a very good scientific analysis of ones field of vision. It was surprisingly narrow
She was out of Gerrys field of Vision all the time. Out of Jezes almost all the time, hidden by vehicles as she walked up and passed by .... and then completely out of their Field of Vision as she walked on up the hill.
.
Tannerman was beyond either mans 'Field of Vision'
This is just a hypothesis but all the facts except maybe the closeness of the parked cars and the quality of the shoes is in verifyable from various statements. It is entirely feasible