You've worked in some of these companies in what capacity?
In what way is the 'narrative' getting away from Sony?
Why are you not bothering to engage with anyone's actual points being raised about Sony's general approach to PR?
Speaking as someone who worked in marketing for several of the worlds largest companies, and who has extensive experience in liaising with their PR companies, while there will have been emails and probably a meeting to discuss the github leaks, knowing Sony's approach to their PR - which is 'we talk when we want to talk, we don't respond to rumours' - their silence over this is entirely what I would expect, and says nothing about the validity of the Github in any way, shape or form.
Also - I would take issue with your claim that product releases require an iron fist on controlling narrative. That may have been true prior to the rise of social media, but these days its a largely impossible dream, especially in the pre-reveal phase where we are now.
Sony's real crisis will be losing control of the narrative after they've done the full announcement/reveal etc the way it did MS after TVTVTV, because MS didn't just have to roll back their messaging, they had to rework the console OS.