[Rock N Jones]

“Sullivan actually came into this case after the Trial judge recused himself without explanation, after Flynn pled guilty. “

According to this article, Sullivan came in shortly after Contreras took the Flynn plea but was very active in making the decision regards sentencing.
https://www.washingtonexaminer.com/byron-york-an-unusual-turn-in-the-michael-flynn-case

[TXnMA]

“Sullivan actually came into this case after the Trial judge recused himself without explanation, after Flynn pled guilty."

Contreras had to recuse -- IIRC, he was on the FISA Court, (and friends with Strozk) as well...

TXnMA