It is ridiculous to base a whole multi-million pound investigation on a hypothesis which is so implausible that you have to search the whole world, tens of thousands of cases, in an attempt to find just one proven example.
It is ridiculous and incompetent to ignore and fail to follow through on evidence ... particularly eye witness evidence ... because dogs untrained for that job have not followed a scent.
Similarly, individuals like child serial killer Robert Black are able to practice for periods of up to and over twenty years by being peripatetic, making each crime and missing child seem unique despite using the same modus operandi.
**snip
Black goes into horrific detail about how he would abduct youngsters in his delivery van as he travelled round the country.
Detectives think Black was talking about actual crimes in the interviews but avoided incriminating himself by claiming to be describing a fantasy, ...
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He was able to evade justice for over 20 years as his job as a driver enabled him to criss-cross police boundaries and stay one step ahead of authorities.
But his luck ran out when a policeman spotted him bundling a little girl into his van in the Borders.
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He was jailed in 1990 but told police practically nothing.
http://www.mirror.co.uk/news/uk-news/child-killer-robert-black-reveals-7430373The Portuguese police had a head start on police dealing with widespread apparently unrelated disappearances of children.
Joana Cipriano disappeared from Figueira which is only seven miles from Praia da Luz.
**snip
A child protection specialist, Mark Williams-Thomas, who believes that Joana's and Madeleine's disappearances are related, said that the disappearance of two children unknown to each other, within a period of four years in a seven-mile radius, would be a huge coincidence, especially considering that Portugal is a small country with few abductions.[11] Before Joana's disappearance, the previous first-degree murder of a child in the Algarve region was in November 1990 and involved a British girl, nine-year-old Rachel Charles, who was abducted and murdered in Albufeira. Her body was found three days later; a British mechanic, Michael Cook, a friend of the family, was arrested and convicted.[12] Leandro Silva, the common-law husband of Leonor Cipriano, said in 2007 that "the only difference between the McCanns and us is that we don't have money."[13]
https://en.wikipedia.org/wiki/Murder_of_Joana_CiprianoThe problem there being that having 'solved' Joana's case with a conviction for murder but no evidence indicating what happened to Joana ... the same team was involved in investigating Madeleine's disappearance.
Would it have been possible for them to have thought outside the box and linked both cases without denting their 'honour' for the expeditious solving one.
Might it not have been very much a case of ~ every size fits all?
In my opinion the man seen leaving the scene of the crime carrying a child on the 3rd May 2007 was an abductor and the barefoot child being carried was Madeleine McCann.
If Robert Black had not been spotted bundling a little girl into his van and later stopped before the child's demise ... there would have been yet another missing child to add to the statistics.
Who knows in this day and age of untraceable children crossing what amount to open borders if Joana and Madeleine were the last or only two of many.