It seems Bob Smart had the idea and Gonçalo Amaral agreed because and only because there was a terrible emergency.
This is not a little detail, it explains the whole operation. If you neglect that detail, the whole episode doesn't make sense.
The rules defined by the Portuguese law for a parade weren't, couldn't be applied due to the time factor. One of these rules is that the person of interest has to know before, democracy legitimately requires it. The issue wasn't to obtain a statement of Ms Tanner but to confirm suspicions against Mr Murat's and launch a police raid.
No evidence was at stake, only intelligence.
If Ms Tanner had said "no way, it's not the man I saw", they might have renounced or at least postponed the police raid. Ms Tanner likely wasn't categorical but she didn't deny it could be the carrier. Now if she had said "yes, this is the carrier I saw", then some appropriate parade or confrontation should have been organized later in order to produce evidence in court.
Can you cite the evidence that this was Bob Small's idea please?
Personally, I have been unable to find out whether Bob Small was even in the van with JT during this identity parade or whether his role was simply to inform JT of the request from the PJ and to meet her at the arranged place. I somehow doubt it as he would have been able to confirm the outcome of the ID parade had he been in the van with her.
I don't agree that it was done because of the 'time factor' - there was nothing to stop a legal identity parade from being organised at the proper time. It would appear that Amaral preferred to trample over Robert Murat's rights and break the law rather than apply proper policing practices.
If as you claim no evidence was at stake, then why bother to do it in the first place? Having heard of the lies told to the McCanns re the dogs and DNA during their interviews - it is not difficult to believe that Murat was told that JT
had positively identified him as the man she saw during
his interview. In fact that would explain his apparent animosity towards JT and his intention to sue her - (although whether that is true or a forum myth I do not know.)
Amaral has used the event to repeatedly and falsely claim that JT positively identified RM - IMO done purely to discredit her credibility as a witness because her sighting completely negated his theory that the parents disposed of Madeleine's body.