Rogue agents wouldn't leave much of a paper trail. They don't tend to slap together slide decks advertising their operations.

The Snowden docs contain nothing about US black budget funded regime change, drug smuggling, politically motivated assassinations or whatever else countless ex-intelligence whistleblowers have claimed to happen in the shadows. I sure don't think all of them can be believed 100% but I wouldn't have expected anything of this nature to show up in typical S/TS/NOFORN documents that someone like Snowden leaked.

Snowden docs don't contain* anything about what happens in DUMBS, secret military facilities like biolabs, propulsion and energy research or anything else* that conspiracy researchers are interested in.

to my knowledge/memory

* Snowden docs were never published in full so we don't know what Guardian et al decided to not publish because they're all too intertwined with intelligence