I agree the word intruder changes it so much.
But I disagree there is evidence against the mccanns.
Here is a link (scroll down a couple of lines and you will see the PDFs for the report) to the final report by the Portuguese attorney general. It states there is no evidence against the mccanns and states that therefore the aguido status will be lifted. Nowhere does it state it is only being lifted because the case was being shelved. It discusses how the dog alerts could not be verified by forensic testing in the UK and Portugal, and that neither could the samples tested by verified as madeleines or a particular type of material I.e blood.
The report also states that kate was made an aguido because she was presented with evidence that the police believed could be used against her, as far as I am aware this is a legal requirement if questioning a witness, a bit like questioning someone under caution in the UK. But if anyone has a link to the technicalities of the aguido system could they link to it.
http://www.mccannpjfiles.co.uk/PJ/TRANSLATIONS.htm
This link is to a piece in the guardian summing up the issues.
http://www.theguardian.com/uk/2008/jul/23/madeleinemccann.portugal