I don't know how many times it must be said but Gonçalo Amaral was not the head investigator. In Portugal, the judges from the Ministério Público orientate investigations and give orders and authorisations to carry out any diligences. This is the same procedure in Spain, Italy and France. There were over a 100 policeman involved in the case and one coordinator did not make all of the decisions as to the orientation of the investigation. In Portugal, the police follow the evidence to see where it leads whereas, I'm beginning to wonder if SY decides before what has happened and then looks for evidence to fit the scenario.
As for the quote from Ricardo Paiva, he stated the contrary in the court room. He said that GA's book had no influence on the information received by the PJ afterwards, when the case had already been shelved. The tweet made from the court room by a British journalist, quoting Paiva, was incorrect but still so many McCann supportert keep on quoting it.
Surely there must be one person in charge of the 'operational' side of the case. It wouldn't work if several people - all on the same level were making decisions. The Judge in the libel trial seemed to think that Amaral was No.1 and that others were his subordinates. The following quote appears to confirm that.
Quote
The Judge – Hierarchically, were you subordinated to Gonçalo Amaral?
TA said that Gonçalo Amaral was the Coordinator and he was under him.
The Judge – Were you Number 2?
TA says it can be said so.
Unquote
IMO the big mistake Amaral made was that he decided on day one who the perpetrators were and then tried to shoehorn in 'evidence' to fit that one theory to the exclusion of anything else. His other big mistake IMO was not meeting or interviewing the McCanns himself. I still find that an incomprehensible decision on his part.
Another huge mistake imo was to order that a tail be put on the UK police when they arrived and to have their every move reported back to him - but to fail to put one on the McCanns when they hired a car. If he had done that - he would either have caught them redhanded or proved that they did not move Madeleine's body in the car. Think of how different things would have been if he had taken that rather obvious course of action - considering they were his only prime suspects.