I would bet its Manafort going down in flames. Guy was pretty shady the last few years, and his house was raided by the FBI recently.
Reason being, he might not have done anything legally wrong, but probobly a few unethical things...
So, Mueller and his investigation needed something fast and quick with the Uranium and Dossier thing blowing up in their faces, and need something to keep the public from thinking about that.... BOOM!!! Manafort!!! Someone has to go down to keep the distraction going from the real collusion!
Sorry Manafort, you must pay the price in this witch hunt cause you aligned with the wrong party, and not the party of Comey, Mueller, Clinton, etc....