Would you kindly furnish us with some examples of these unturned stones?
Yup. Did one today on the blog.
The two free mobiles that turned up on 4th May 2007 in Portimão could well contain a treasure trove of information.
This information could well point to guilt, or to innocence, or of course to neither.
David Payne's free mobile might well have been picked up Leicestershire Police, and be part of the SY phone analysis. Or it may not.
The McCann's free mobile could point to, or to rule out, all sorts of vague broo-ha-ha around the case.
Rumour 1. Gerry plants body in flowerbed of Urbanisation Melody. UM is in a different cell on the network to Luz. I have seen nothing in the PJ phone traffic analysis to place him in UM.
Rumour 2. Gerry uses the Scenic to dispose of Madeleine's body in .... well take your pick on this one. Huge chunks of Portugal and Spain. I have seen nothing in the PJ analysis to suggest this.
The main PJ analysis made an assumption - that any period of phone silence over 30 minutes was potentially significant. This on the basis that such a time period allows travel to Burgau in the west, Almádena to the north west, and Oxiáxere, to the east. And back again, whilst all the time looking like being in Luz.
If the traffic between two said mobiles establishes some weird diversion somewhere, it points to guilt. If the traffic fills in some of the half hour gaps, it can increase the evidence of innocence.
It could do neither, and since I don't know where the McCanns free mobile ended up, I can at this time only speculate.
However, the McCanns know where that free mobile ended up. It is just one unturned stone that could advance the investigation. (And no, I don't know whether SY has had access to that phone.)