I think Manafort is a little dirty, but not as bad as team Mueller claims. McCarthy did a good piece on the Gates charge and plea bargain. Manafort is in about the same boat. Not lilly white. The fact that Manafort is willing to go to trial tells me Mueller does not have a slam dunk case. I'll be surprised if Manafort goes to jail. If he is tried and convicted, I bet he gets the Scooter Libby treatment - sentence commuted. That is three years out.
I think Manafort and Flynn have evidence from the phone conversations between the FBI lovers that they were fixing interview files to make those being questioned look guilty.
I read about this in a source a long time ago and don’t have a link for you on the conversation. Sorry.