Sessions has been working silently in the background, making sure that the most important(!) indictments are now legally waterproof. So that no one will escape justice through loopholes or technicalities.
Trump did a lot of Kabuki theater, to distract the enemy and to distract vom Sessions' most important work.
Why do people not understand this?
Whitaker took Sessions' position now, because Whitaker has no history with Trump, or the Russian Collusion investigation.
Sessions did his part.
Whitaker is taking over from here.
Whitaker is only an interim(!) acting(!) attorny: that means that Withaker has NO TIES to NOBODY.
And he can do everything, what is right, without risking his future career, because he doesn't HAVE a future career (in this place), this is the beauty of being (only) an ACTING attorney.