It's pretty simple, really - Sullivan is acting as the wing-man for Obama and Holder (and maybe Lynch). Obama clearly hates Flynn, and is doing whatever he can to mess up Flynn's life via Sullivan. Sullivan has accomplished what he set out to do - extend this past the election - so I think his next step will be to retire so someone else can clean up the mess, and he sails off with his government pension.
There’s more to it than that. Sullivan used to be a straight shooter. His son got in trouble for some really bad things. Those were fixed for him by the deep state. He is now in their debt. Barr should be investigating that, but he is not.
I recall Sullivan’s son allegedly raped a woman/girl. RR slow-walked it through the system and effectively made it go away.