You can type until the end of time, but it doesn't meant there was an abductor.
Madeleine McCann vanished while on holiday in Praia da Luz.
Despite the best efforts of the initial investigation to pin the blame for that disappearance on her parents ... in particular her mother ... no evidence was found to justify that approach.
The present Scotland Yard and Policia Judicairia investigations having gone back to square one by reassessing everything which was available to the initial investigation and coordinating it with all the information subsequently gathered ... are ... wait for it ...
looking for the stranger/s responsible for abducting Madeleine.
The time will come when like all cases there will be a resolution one way or the other and I am sure if the same scrutiny were to be given to what SY and the PJ have achieved over the past four years there might be avenues which could well have been followed.
It must rank as one of the most intensive investigations in history and I'll guarantee lots of lessons must have been learned from it ... in particular the new working relationship of the Brits and Portuguese.
It has obviously been determined that there is still enough work to keep four detectives on the case for the foreseeable future ... some of us are content about that.