Days later that would be normal, in regards to details, memory normally starts changing slightly, due to the passage of time. Every lawyer in the courtroom knows this.
What everyone needs to remember, is all the evidence nearly perfectly supports what Z has stated...Over and over.
And when things are gone over, over and over, there are some details and memory that will alter or change slightly.
Days later that would be normal, in regards to details, memory normally starts changing slightly, due to the passage of time. Every lawyer in the courtroom knows this.