Something possibly of note to consider. We know the DS has no qualms about taking out any situation that poses risk. That said I have dedicated my research today to the retirements/not seeking reelection situation.
Now that Ryan announced that makes another who was present during the "train crash" awhile back. Of those present nearly all have since or, before, announced such plans.
My point? The DS knew that the White House had presented them with a "give us information, retire quietly, or be publicly disgraced/go to jail" option and made their move. Preliminary at moment but wanted to throw it out there.