I wonder how much Laura Poitras played in helping to structure the release of information as it has been done? I think that a movie maker might have a greater understanding of how to build an arc of a story.
This may be another factor:
Greenwald addressed the methodology of releases directly here:
A highlight from first link above:
" ... in his Washington Post interview with Snowden last month, Bart Gellman noted "Snowden’s insistence, to this reporter and others, that he does not want the documents published in bulk." From the start, Snowden indeed repeatedly insisted on that.
Anyone who demands that we "release all documents" - or even release large numbers in bulk - is demanding that we violate our agreement with our source, disregard the framework we created when he gave us the documents, jeopardize his interests in multiple ways, and subject him to far greater legal (and other) dangers. I find that demand to be unconscionable, and we will never, ever violate our agreement with him no matter how many people want us to.
That said, we have published an extraordinary number of top secret NSA documents around the world in a short period of time. And our work is very far from done: there are many, many more documents and stories that we will publish.
Toward that end, we have very carefully increased the number of journalists and experts who are working on these documents and who have access to them. We are now working with more experts in cryptography and hacking than ever. One of the most exciting things about our new organization is that we now have the resources to process and report these documents more quickly and efficiently than ever before, consistent with ensuring that we don't make the kinds of errors that would allow others to attack the reporting.
These documents are complex. Sometimes they take a good deal of reporting to fill in some of the gaps. From the start, people have been eager for us to make serious mistakes so they can exploit them to discredit the reporting, and so we work very hard to make sure that doesn't happen. That takes time. Convincing media institutions (and their armies of risk-averse lawyers, editors and executives) to publish documents, the aggressive way we think they need to be published, also often takes a lot of time. ... "
If you have some time, read the rest here. I think it may address at least some questions people have about the release methodologies and perhaps challenges they may not have been aware of, etc.