Sundance seems to have lost his mind.
I know, right? I do hope he's been played, and that he's been misled on the role of this investigator, William Aldenberg who does indeed appear to be solid Swamp.
My theory is that Sundance's pessimistic conclusions are based on an op the real investigators ran on him; a feint.
Because NO ONE associated with the Durham investigation is leaking.
Neither friend nor foe.
He left with making $h!t up and compromising agents gleaned from the publicly available FBI org-chart.