The Psychology of memory is complex. Memory is not a single facet, nor is it always accurate, or more accurate later rather than earlier.
Each time a memory is rehear..d (either silently or with other people, significant changes are introduced into the internal narrative that may in themselves become part of future recall.
Also, in interviews, what is produced is extremely dependent on the questions being asked and the context of the interview.
Anyone who claims to ´know´what statement is correct and what is not is either stupid or acting well above their intellectual pay-grade.
What we can know, without a shadow of doubt, is that when Gerry McCann said he entered the front door using his key ... and then said that he entered through the open patio doors ... that one of the statements had to be untrue
No need for anyone to punch above their intellectual weight to come to that simple conclusion
It is of course impossible for both to be true. But it is possible for a person to have different memories about the same event. This is normal. It does NOT mean that one of the statements is a lie- merely that his recollection was different at different times.
OK, let's explore that theory in relation to Gerry's two statements
The Tapas group arrived in Portugal on Saturday, and ate, together with their children in the Millenium restaurant that night
The following night ( Sunday night ) they ate for the first time in the Tapas bar, leaving their children in the apartments
That's when the McCanns started leaving the patio doors unlocked for checking ... on the very first night of using the tapas bar
So then, where did this memory of going in through the front door using his key to do a check come from ?
How could Gerry McCann remember doing something he had
never done ?