Bannon is a wild card, playing both sides so far. The biggest bomb he potentially has to drop, in the public domain as of now, is his claim he thinks that the Russians who met with Jr. in the Tower also met with Trump, as he claimed per the Wolff book. But he wasn’t even part of the team then, so it’s second hand at best. My guess is Wolff misquoted him, but I wouldn’t trust Bannon either. Remains to be seen what Bannon may or may not say now, and chances are he won’t go quietly.
There was already a report (rumor) that Bannon told the House Intel Committee that the comment about Don Jr. taking the Russian lawyer to meet Trump was just speculation, i.e., Bannon has zero knowledge of any such event. But it was an idiotic thing to say, especially in the current climate.
-—he thinks-—
Fake Special Prosecutor effort