I think that is the plan, to show that no one has a clear memory of just who told whom and when. I think that the plan is to demonstrate that the information was not that big an issue because no one thought that the information was classified, so the timeline was not something that stuck in anyone's mind.
He did so without objection.
First thing they asked him for were his "reporter's notes" which he gladly handed over.
Richard said he had dyslyxia and writer's cramp (actual maladies that really do make your meaningless writing unreadable) so bad that even he couldn't read his notes once they were no longer "fresh".
Here we are finding that Richard is not alone ~ these reporters have gotten so used to keyboards they can no longer "take notes" that mean anything to anybody, and there go all the dates.
Fitzgerald should have read Cohen's commentaries on notes.