1) It will be a real mind effer if the Attorney General invokes the 5th Amendment today.
2) Almost more likely, he un-recuses himself, fires Mueller and maybe Rosenstein two hours before the hearing.
3) Less likely: the Veep, the generals, Tillerson, etc., run a 25th amendment coup d'etat.
4) I know everyone thinks the public accolade part of the first full cabinet meeting had chimes of 3rd world/totalitarian politics. This is overthinking it; the cabinet merely provided, in exchange for their honor, what is known in the dating world as a courtesy fuck.