One was replying to a previous post about the McCanns 'pushing' their theory via the media. The cite to Neves evidence was to debunk the suggestion that the investigation only followed one theory. Does 'case investigator' mean 'case director'? In my opinion Encarnacao was in charge and made the decisions about what to investigate.
Neves didn't appear capable of imparting a great deal of information though.
Snip
SO – Have you any knowledge about how the "death" theory came about?
LN says there was no such theory
in the beginning; he even remembers that Guilhermino Encarnação talked of abduction.
But with time this idea had to be contemplated. He says that Madeleine's parents were the first to talk of death.
http://miscarriageofjustice.co/index.php?topic=2600.0In my opinion the cite you chose exemplifies just a little of what Kate and Gerry were up against and why it became necessary for them to collaborate with the press in order to have anything at all done for Madeleine's case.