My sense is that its a question of whether Snowden's release was really just a limited hangout. Publicly damaging to the NSA as part of turf warfare inside the USG, specifically to hurt the NSA while giving more power to CIA.
Was Snowden acting in good faith for the CIA, not realizing their motives?
Or was Snowden part of a plot to secretly give far more technical details to China, Russia, Cabal than were publicly revealed to Greenwald?
Note that the limited hangout also provided him with credibility to join/lead these whistleblower groups… perhaps giving them an inside spy into the workings of these organizations.