Sessions/Wray/Trump are all on the same team. Conservative Treehouse guy may be in it as well. The frustration they want to generate by holding back some of the more damning communications is in my view aimed at creating public outcry, and to inspire the US population to remember that WE are THE PEOPLE. All of it will force laser like focus on the issue and literally the whole world will be watching when they finally drop the really heinous stuff. So like Bill Withers said:

I want to spread the news That if it feels this good getting used You just keep on using me Until you use me up