You are telling me that there are McCann supporters who have claimed the McCanns are ALWAYS right and all other independent witnesses are always wrong?? If there are they must be in a very small minority. Most McCann supporters understand that there are likely to be some inaccuracies and discrepancies in witness statements, whoever has given them.
A perfect illustration of your point is Carol Tranmer's realisation at her rogatory interview that she was in error over dates given in her original statement ... nothing deliberate ... nothing suspicious ... just human error.
If three or four individuals give concise unshakeable statements, all matching, all slotting one into the other with no discernible discrepancies ... I think that would be the time for suspicion.
**snip
CT'No.
DC1485'So that date is incorrect'
CT'Yes. It was in fact in April.
DC1485'April, this is it then'
CT'Yes, I should have read this.
DC1485'Yes.
CT'Or no, I don't know.
DC1485'It says here, Saturday, the 28th of May.
CT'It was the 28th of April because it was on the 3rd, Thursday, when we took my aunt to lunch.
CT'Yes and after we went to visit her on Sunday. We visited her on the 29th of April.
DC1485'And here it says May, thus this statement is incorrect, right'
CT'Yes of course.
DC1485'Good. Let us clarify the statement collected on the 8th of May, relative to the dates referred to.
CT'Yes, it was wrong, it was in April.
DC1485'In fact it should be Saturday, the 28th of April.
CT'Sure.
DC1485'This is correct, of course it was.
CT'I got confused when I read this.
DC1485'Yes, I would also get confused.
DC1485'Good, then in relation to the date, everything is now correct'
CT'Yes, yes.
DC1485'Yes, good. Relative to what you said happened on Thursday, your statement states that Thursday, the 3rd, you went to visit your aunt. Therefore, you saw her on Sunday'
http://www.mccannpjfiles.co.uk/PJ/CAROL_TRANMER.htm