Would you not agree that there is (or at least should be) a notion of accountability?
That is to say that even if it can't be proven that Amaral was personally and directly responsible for the leaks on his watch, is it not reasonable that he should be held accountable for them?
In a word, no.
There appears to have been, in 2007, a
culture where despite the requirement for judicial secrecy, it was commonplace for the Portuguese police to break bread with journalists and for case details to be discussed. I am not defending this, merely stating that it seems to have been the norm, or at least, not unusual.
In the McCann case in the OG phase, there seem to have been leaks, and the origin of those leaks seems to have been in the UK.
For example, UK media correctly predicted that there were to be 3 areas dug around Luz, even if they guessed the wrong 3 areas. Then there was Andy's helicopter trip over Luz, accompanied by a Sky News helicopter.
I am not aware of either 'event' making the Portuguese media. If they did, kindly correct me because it changes the situation.
If not, the fact that the British media detected this directly suggests OG was leaking.
Expecting Amaral to change a culture on 3 May 2007 is like expecting the Met to cease being racist or sexist overnight. It is simply an unreasonable expectation.