Don't be silly Dave, Gonçalo was there, and saw and heard a hell of a lot more than is reported in the files. In those circumstances he was best placed to solve the case but we all now know he was thwarted by the English authorities who refused to undertake certain requests relating to Madeleine's parents and the tapas group. Then there was the fiasco involving the FSS, a now disbanded discredited organisation.
I think GA had access to the files only in the first 5 months, and I am not sure he read them in that period. After being fired he lost access to the files until July, 2008, where they were made public ... It seems that in the beggining he was searching for a rapid solution, so he took into account the sayings of a journalist, and focused all his efforts in Murat ... When it became obvious that Murat was not guilty, he desperately tried to involved the McCanns, focusing all his efforts in them, with no results ... The first five months lost ... No alternative hypothesis was tested: for example, burglary that went wrong, paedo, or a combination of the two ... CB has an "interesting profile", like the OC driver, JCFdS ... But a "profile" is not enough.