This is a good read - Mueller indictments beg the questions: why Manafort? Why Papadopoulos? Why now?

Mueller knows the contents of all of the other documents he has subpoenaed so far. Mueller knows what was said in the interviews with other witnesses he has conducted. And he knows the answer to the biggest question of them all. He knows why he didn’t charge Michael Flynn.

There are only two reasons Mueller didn’t charge Michael Flynn on Monday. The first is that he hasn’t finished with his investigation and he’s going to charge him at some point in the future. The second is, like he did with Papadopoulos, he has already arrested Flynn, charged him and made a plea deal. It’s known that Flynn failed to register as a lobbyist for foreign powers, a charge that Mueller has already brought against Manafort and Gates. It’s known that at the time Sally Yates reported him to the White House for lying to the Vice President about his contacts with Russian Ambassador Sergey Kislyak, Flynn lied to the FBI, a charge Mueller has already brought against Papadopoulos.

Michael Flynn spent more time with candidate Trump last year than anyone. Michael Flynn was the cut-out Trump used to Russian Ambassador Sergey Kislyak. Michael Flynn was in the meeting at Trump Tower between Jared Kushner, Kislyak, and Sergey Gorkov, the head Vnesheconombank, the Russian state bank currently under U.S. sanctions. Michael Flynn knows everything there is to know about Trump and the Russians.

I think Special Counsel Mueller already knows what Michael Flynn knows. When it comes to Trump and the Russians, Robert Mueller knows what happened.

Lots more building up to my snip.