Based on the limited research I’ve been able to dig up on this, I think this suggests Epstein felt he understood Trump’s patterns of behavior and or deception.
And it sounds like he’s teaching this knowledge to bannon, from these emails? “good catch and yes” sounds to me like they had a prior conversation where Epstein shared how Trump works with Bannon, Bannon shares this Nytimes article as an example of what they’d discussed, and then Epstein agrees and validates him.