Boy better talk while he still can.
The "boy" is obviously not a dummy; there are serious players and interests involved and he has very valuable information.
The first thing he put on the table was a broad outline of his proposed statement, together with a request for effective security for him and his family. With that assurance, along with documentation of the arrangement satisfactory to his attorney, the next thing on the table was a first pass at the details of the outline.
Much of that, if not all, has been completed; otherwise, this would not be in the public arena. Just sayin'.