Why didn't the PJ recall Gerry as soon as that 60-80% positive identification was made by MS? Think about it and you'll understand why SY couldn't just pull in a person Crecheman may have identified as being near 5A on 3/5.
The Prosecutor realised in September 2007 that the time of Madeleine's disappearance had never been confirmed;
whether to confirm or deny its occurrence in relation to the crimes of abduction, homicide, exposure to abandonment and hiding of the body and according to defined plan,it is necessary to document the real time of the disappearance in question, establish the location of each of the intervening parties - from the McCann couple to the group of friends who were on holiday with them in the Ocean Club tourist apartments in Praia da Luz :
http://www.mccannpjfiles.co.uk/PJ/RE_ENACTMENT.htmThe following day Mr Smith contacted UK police to tell them of his suspicions about who he saw on 3rd May. I think that made it imperative that the timeline was examined, because the timeline was Gerry's alibi for the time of the Smith sighting. Accordingly;
In the letter of request sent to the United Kingdom relating to the disappearance of Madeleine McCann it was requested that the witnesses who were on holiday with Madeleine's parents would inform us about their availability to come to Portugal to do a reconstruction, the dates proposed being 28/29 April or 15/16 May
http://www.mccannpjfiles.co.uk/PJ/RE_ENACTMENT.htm