Firstly you don't know when Amaral's first visit to PdL took place, you only know the date of his first recorded visit. Secondly you have no idea what he was doing because you don't have his job description. Therefore your criticisms are based purely upon your opinions, which may well be wrong.
Who was this predecessor btw? Or is it his successor you're referring to?
This whole tiresome episode was generated by you when you posted
"Amaral's book does describe how he went to PdL on 10th May, and he saw Murat with his mother. I didn't see any reference to a direct line of sight from their villa to 5A though. Was that mentioned in Amaral's book or elsewhere?" https://miscarriageofjustice.co/index.php?topic=11585.msg693458#msg693458And your statement in your post
"you don't know when Amaral's first visit to PdL took place, you only know the date of his first recorded visit" is equally applicable to your supposition regarding Rebelo.
The difference between the two senior investigating officers could not have been more marked Rebelo arrived,
"In the company of the team members that he brought in from Lisbon - composed of two homicide inspectors, one from sexual abuse, another that is experienced in robberies and two specialists in technical analysis - Paulo Rebelo tried to find details and loose ends that may open new leads or confirm the existing ones."
https://themaddiecasefiles.com/rebelo-tests-scenarios-in-luz-cdm-30-10-07-t2344.htmlIn the event Goncalo Amaral brought with him peasant attitudes and his untried and untested theories none of which were confirmed as valid when tested by Rebelo's professional team.
Yet nearly fifteen years down the line he can suddenly call to mind that Brueckner was on police radar in 2007, but his team just couldn't be bothered (or were instructed not to) find another door behind which they might have located Brueckner had they knocked.