There were a number of people on the stand in this trial who confused event order but only one was prosecuted for it.
If you want to now jump to the 'everybody forgot things' saw, then we may as well take perjury off the books because there will never be a trial with witnesses who haven't forgotten things.
NINE people had conversations with Libby. We know he knew about Plame. If he had done what Rove did, and corrected his story before the GJ, he never would've been prosecuted. He played with fire instead.