I understand that. But one of Libby's "lies", according to Fitzgerald, was that he learned Plame's status from a reporter. Now, we know of one more reporter who knew...apparently before Libby did (according to Fitzgerald's timeline).
At the same time, Woodward testimony established that yet another reporter (Walter Pincus) also knew -- and at an early date (and that, incidentally, he may have lied about that very point to the grand jury).
Maybe Libby told Fitz that Woodward mentioned Plame to him. One of the questions Woodward was asked was whether he could have mentioned Plame to Libby, and he said he simply couldn't remember. He said (read his release about his testimony) that he had with him a questionaire which included a question about Plame and Wilson, but he doesn't have a record of asking the question or getting a response.
He also said that if Libby had said anything to HIM about it, woodward is sure he would have put it in his notes. So it is clear that Libby didn't tell Woodward, but Woodward simply can't remember if woodward told Libby.
If Libby can say that he simply got confused over WHICH reporter told him, and that it was Woodward, not the others, and Woodward can't say he didn't, that might help Libby.