Scotland Yard didn’t think the damage was insurmountable or they would never have taken it on.
How much do you actually know about the investigation of Madeleine's case???
The Amaral/Almeida investigation was superseded by the Rebelo investigation after Amaral was sacked and Almeida took leave of absence
https://www.theguardian.com/uk/2007/oct/03/ukcrime.uknews4 More details here ~
Top officer takes over in McCann case https://www.theguardian.com/uk/2007/oct/09/ukcrime.madeleinemccannRebelo's first task was to make some sense of the disorder the Amaral investigation had left behind them ...
SnipPaulo Rebelo, the new police chief leading the Madeleine McCann investigation, is furious at how it was left in disarray by his predecessor.
According to reports, officers have spent the past fortnight processing information left lying around on scraps of paper and following leads ignored by police working under Chief Inspector Goncalo Amaral.
Following Amaral's removal after he criticised British police, Rebelo, one of Portugal's national deputy police chiefs, is reviewing the whole forensic investigation because of earlier procedural errors.
https://www.standard.co.uk/news/madeleine-new-police-chiefs-fury-over-the-mess-he-inherited-from-his-predecessor-6669085.htmlAnd that is only the tip of the iceberg.
But the main points are that the Amaral investigation 'screwed up' and what could be salvaged from the mess was put into some sort of order by Rebelo and the specialist team he brought with him.
The files with which we are familiar today are the result of that ... "His appointment is an attempt to regain control of the investigation into Madeleine's disappearance ... " and in conjunction with the proper conduct of the case ... "Her parents, Gerry and Kate McCann, were named as official suspects on September 7, but a magistrate ruled the police had yet to gather sufficient evidence to warrant further questioning of the couple over the disappearance of their daughter."
https://www.theguardian.com/uk/2007/oct/09/ukcrime.madeleinemccannSo in effect you are following entirely the wrong illusion if you think for a minute that Amaral contributed anything but disarray to Madeleine's investigation or that any self respecting investigating body would be able to refer to what he left behind ... certainly the Judicial Police who took over from him couldn't.
Scotland Yard used Rebelo's work ... without which it would have been impossible for Scotland Yard or anyone else to penetrate the mess of an investigation Amaral left behind.
Snip Meanwhile, a police source quoted in a Portuguese newspaper said: "There was important material lying all over the place that hadn't been considered by investigators.
"A lot of key information was discarded. The whole process is being reviewed. Putting all the papers in order has been a massive task."
Officers have been working round-the-clock to log on to a computer all information relating to the disappearance of four-year-old Madeleine from the holiday complex in May.
https://www.standard.co.uk/news/madeleine-new-police-chiefs-fury-over-the-mess-he-inherited-from-his-predecessor-6669085.html