The first investigation investigated the parents thoroughly and found no evidence against them so it was fair enough to say that parental involvement had been dealt with. The fact that the current Portuguese investigation is not focusing on the parents either suggests that they too feel that parental involvement has been dealt with. I don’t think you should be accusing Rowley of lying.
There is no comparison with the Sutton led investigation into Levi Bellfield's murderous rampages and the Amaral led investigation into Madeleine McCann's disappearance.
The former was evidence led.
The latter was not.
The latter failed to produce any evidence which far from leading to the possibility of solving the case was botched and non-existent.
As in the failed forensic examinations made in the McCann apartment in the early hours of the 4th May which might actually have destroyed evidence.
Or was misinterpreted by the investigators ... as in the forensic evidence supplied by the FSS ... prior to Kate and Gerry McCann being constituted arguidos as a precursor to charges being laid against them.
The fact no charges were laid and Amaral was sacked from the investigation speaks volumes.