I think he he is in the know and super OK with it, but hasn't done actual dirt himself.

Just my feel ... But, possibly giving him too much credit.

someone else at DOJ will have to arrest Sessions when this thing breaks wide open.

Nothing.

And that would explain their distressed, forlorn body language when she said a few words to the press after the briefing?

It's not just Trump or Pence, or Ryan, or McConnell, anyone who has the Magic R next to their name is guilty of this act of treason. If you connect the dots, just about every single republican is involved somehow. Our whole damn government has been compromised. They're far more concerned about protecting their precious fucking majority than their are about serving the people. It's a clusterfuck of epic proportions and it's going to take decades, centuries even to sort this mess out. We may never know the extent of the damage done until they're all gone. And they're OK with it.