I'm not suggesting he will actually be able to justify his claims. Theoretically he would have to in order to defend himself. In reality he will find it very hard to do so, as will the McCanns.
I disagree
Amaral would certainly find it hard ( indeed, impossible ) to
'prove' his claims ...
'justifying' them, though, is quite a different thing
He is not required to establish, unquestionably, that Madeleine died in the aprtment and that her parents subsequently staged an abduction, but, rather, to establish that his opinion is reasonable and grounded, given the information available to him
The Judge does not have to be convinced that Amaral's conclusions are correct, merely that they are not groundless and insupportable
If Amaral brings witnesses ( particularly if they are senior police professionals ) who share his opinion that the most
probable explanation for Madeleine's disappearance is that she died in the apartment, then it will add to the premise that he was 'justified' in coming to the conclusions he did