If they throw him under the bus why wouldn’t he turn on them and bring them all down?
Personally, I'm a tad wary of https://twitter.com/Thomas1774Paine (his twitter account) myself, and would wait for some more confirmation. But there is a logical appeal here,as you note, because this is the "Prisoner's Dilemma," right?
He won’t turn on them. His refusal to talk will earn him their “gratitude” in terms of employment opportunities and other financial support so that he can maintain the lifestyle to which he has become accustomed.
As a former FBI official, he will never do time. Sure, he’ll suffer some indignities due to exposure of his role in this nefarious scandal, but he will be otherwise free to find a cushy job in some liberal think tank or in academia. Political elites are not subject to the same laws that we are.