Why the delays? Just blow it wide open and be done with the traitors and scumbags!!!
Fumigate, expose the traitors, and prosecute.
Money, basically. Book sales and increasing his "media exposure" (now and in future).
Their agents tell them this is how they are supposed to play the game. If they just put it all out there, the story becomes the focus and they (as the source or one of the sources) become lost in the shuffle. Then, when future interviews or media opportunities are explored, they find themselves in less of a position to demand anything (money or air time) because the media outlet says: "Who are you again?"
They feel they can't blow their big opportunities.
I agree with you, it sucks, and many times (most times), the hype never lives up to the build up. Plus, we are interested in the truth, not their side career as a media source or analyst. But that is the way it is.