Earlier quoted context omitted.
Are you saying that the "collection directly from the servers" claim of the NSA document is simply the systems we already know about (FISA warrants or otherwise) until proven otherwise? To me the terminology of the document probably (though not necessarily) indicates something more serious, but I'm not sure its necessarily 'cables into gmail' (which you seem to indicate as the only alternate). For instance, potential…
Marc Ambinder, a reporter who has covered the national security beat for many years (before that he was a political reporter for The Atlantic, and before that the White House reporter for --- I think? --- CBS), reported that PRISM is a system of dropbox servers and a user interface that allows seamless access to all of those servers, presumably so that analysts don't have to keep track of which data is affiliated wit…
That would not contradict the Guardian reporting, or even what the NSA's slides claim.
The rest of what you state also does not contradict Guardians reporting: They make specific claims about specific subsets of these companies data.
You keep arguing about an expansive interpretation of the reporting even when faced with much more restricted alternative interpretations.
When comes to relying on press releases with denials, I'm clearly more cynical than you - I assign them pretty much zero value as evidence. I'd expect these companies to issue denials whether the claims are true or not, so I don't see the press releases as containing any useful information to draw inferences from.