Amaral has it back to front.. Kateanswerred all questions as a witness but not.... As an arguido.. This was done on the advice of her lawyer
In my opinion confirming the important point you made was that Kate and Gerry McCann co-operated fully with the Policia Judiciaria and answered all their questions at all times.
Over a marathon PJ interview lasting over eleven hours Kate answered every question put to her just prior to being made an arguida. She exercised her legal entitlement to silence having been 'read her rights'. What is wrong with that, pray?
It is worth bearing in mind that Kate and Gerry were made arguidos on the basis of the Amaral investigation's failure to fully comprehend forensic information.
Competent investigation of the facts of the case led by another coordinator, including a proper understanding of the forensic evidence meant that there was no evidence to charge anyone with anything. Which in my opinion proves that there was no evidence to justify making anyone an arguido in the first place.
This is a prejudicial situation recognised and addressed in the Portuguese Criminal Code by a change in the law which came into effect days after Kate and Gerry were made arguidos to ensure that evidence justifying the imposition had to be put before a magistrate.
In my opinion the arguido questions fade into insignificance when balanced against the imposition of arguido status in the face of a known impending change in the law under which it would most likely not have been allowed.