They, coup co-conspirators, all knew it was Flynn who was the one being unmasked. It was done for political purposes. What’s so hard to get?
You believe that they knew it was Flynn and I believe they knew it was Flynn, but if the procedure is to request the unmasking of Person X, whose identity is usually previously unknown, then providing lists of unmasking requests is not particularly indicting. What’s so hard to get?
Why bother to unmask if you know who it is?
Leaking the conversation's a different story.