That's a conspiracy theory too far for me. There are incongruities in all of what's happened over the last two years, but the simpler explanation is Snowden is/was smarter than we normally think someone hung out in public can be. If the CIA were behind it all, we'd have to credit them with outlandish new close-up magic abilities. Have there been similar media circuses orchestrated by the CIA that drew so much attention to spying itself? I do not doubt there have been media circuses orchestrated in the past, but surely they go out of their way to avoid any hint of meta-texts. The involvement of agencies is meant to be invisible.
What we're used to in the world of whistleblowers are people like Chelsea Manning, which is to say, people who get caught and crushed. They don't get away with it. The whole story is how horrible it is for them in prison after the fact. The leap we have to make to accept Snowden is he had what we haven't seen before, a strategy that keeps him out of the hands of the government. He gets away.