This has the makings of a carefully concocted set up.
They made these documents so that their veracity would be challenged and now they can trot out their real source... Mrs. Knox.
they've already blown it, they should have done it in reverse to achieve what you are saying - now that they have released phony documents first, the story is dead, even if she does come forward now with her story.
Then why not just interview her in the first report? Your idea is too tin-foil hat for my tastes.