Well, it is still early days. Let us wait to see how Pope Francis deals with Cardinal Burke in his 'Cardinalis Patronus' role. And how Burke responds to the treatment, of course.
As for the 'source' material, it seems clear that a lot of information has been leaked, doubtless 'off the record', by the Vatican investigation team and (one supposes) at Parolin's behest. All governments work like this. The Vatican is no different. It is unlikely that you, I or anyone here will ever know the full story.