not having to prepare for and go thru another trial.
if manafort and his attorneys made it absolutely clear to mueller that no matter what the government offers that he will under no circumstances turn on trump, then what would be the point of mueller taking it to trial?
To make an example of him?
I'm not a lawyer and don't claim to be an expert on the subject but if I'm Mueller and I can't get Manafort to talk, I'd throw the book at him and show everybody what happens when you don't cooperate.