The PJ were rather overwhelmed with information and people coming and going from the resort, Top that off with the language barrier. It is interesting that the second documentary in the TVNZ Cold Case series was a case where the NZ police had to deal with Vietnamese speaking suspects.
It ended up the police actually used a potential suspect to interpret between then and the wife of the missing man.
I couldn't help but see the similarity between that case and the McCann case. https://www.tvnz.co.nz/shows/cold-case/episodes/s1-e2
I think you may be right. They had dozens of potential sightings of Madeleine to follow up, they had the McCanns asking them to follow up psychics information and other peoples claims such as Danie Krügel, it would be hard to keep on track.
Brietta, Vertigo Swirl, I actually wasn't meaning secret evidence (I have already said this) against the mccanns, rather that Almeida was working the case every day and seeing the information as it arrived within the police force. This plus discussions between the police officers would give him an insight we now don't have or were you both there.
I have seen a lot of criticism of the original PJ work but I honestly think any police force would find it difficult with all the information flying in and the UK media's constant criticism. Also just look at how many sightings there were in 2007 that would have to be followed up IMO
https://en.wikipedia.org/wiki/Reported_sightings_of_Madeleine_McCann