If you're playing within your capability, what's the point? If you're not pushing your own technique to its own limits with the risk that it might just crumble at any moment, then you're not really doing your job.
Potentially significant, by the way, because we don't know exactly what's in Matt Cooper's notes, and we don't know - and we don't still know the answer to the crucial question of whether it was Rove or somebody else that revealed Valerie Plame's name to him.