Manafort won't spend much time in the pen. He's gonna squeal on all the DS traitors. Give up his wealth and knowledge for eventual freedom.
He went to trial the first time, not to avoid making a deal to testify against POTUS (cuz there wasn't anything he could testify too), he went to trial to avoid having to out the cabal. "Safety" for his family. Manafort is a made man and has lots to say.