At the time, former federal prosecutor Joyce White Vance said: “Flynn’s deal strongly implies there is more to come from Mueller. The memo, with its many redactions, tells us something significant and important is coming, even though we don’t know exactly what it is.”

We still don’t know, Abramson said. No subsequent indictments can be linked to knowledge that in particular Flynn would be privy to.

Up to this point there have also been no charges based on the lengthy cooperation of George Nader, the Lebanese American businessman who acted as an adviser to the United Arab Emirates. Last month, Mueller also re-extended a sentencing hearing for Rick Gates, a top official to Manafort, and told the court that Gates was still assisting the special counsel in several ongoing investigations.

In several cases, additional information could still flow to prosecutors — like the recently indicted Roger Stone, as well as Maria Butina, who pleaded guilty in December, and her boyfriend Paul Erickson, charged earlier this month. Even Trump’s former personal attorney Michael Cohen and former campaign manager Paul Manafort could reveal new information after sentencing…