IMO the Smiths have played a blinder.
They couldn't produce efits to go with their original statements to the PJ.
They could produce efits for a firm of private investigators, which would be inadmissible as evidence under Portuguese law.
They efit they produced was for PI's who have no legal jurisdiction in the UK therefore the Smiths have committed no criminal offence.
One of the efits produced looked like it had walked off the page of GM's passport, so that wasn't the outcome both the PI's & McCanns were anticipating.
If SY finally took the decision to release those efits to the public, safe in the knowledge that GM was not Smithman, they were not compromising the Smiths' legal position in any way.
If the Portuguese media took the decision to release those efits in their country, they would be proving the Smiths to be unreliable & untruthful witnesses, thus undermining their own police force's investigation.
Does that make sense?
**Snip
In the United Kingdom, just 10% of composite faces are released to the media.
The remainder are used for internal police enquiries: around half are shown to informants familiar with the appearance of local criminals and another third used for house-to-house enquiries in the hope that it will cue a tentative identification (Kitson, Darnbrough & Shields, 1978).
Inevitably many composites end up neglected in police files or thumb tacked to bulletin boards.
http://www.valentinemoore.co.uk/trv/DVfacialcomposite.pdfWhich seems to suggest another reason why the efits were not released until it suited SY decided they wanted them released to the public domain.
It is apparently procedure to use efits in different ways and sometimes not to release them at all.
There is no set formula or preferred system for getting the information required to construct an image; but I think it would probably be true to say that a prerequisite is that immediately after seeing a person the witness should be capable of recalling features to enable a reconstruction.
The three members of the Smith family whose statements we have seen are on record as stating they were unable to do that.
The descriptions came from somewhere: I for one would be interested in the methodology used to generate memories which could not be recalled in 2007, in the weeks after the event.