Snowden no longer can be given credit for anything; He released everything he stole months ago.
A finite, but as of now undetermined, amount of data was conveyed to journalists. I am keenly interested in seeing objective proof that the sum of those disclosures is equal to the sum of all information in his possession. If you're planning on using Snowden's public statements in support of your view that everything he has is already in someone else's hands, I suggest you consult the dictionary for the definition of "naive."
I served in the United States Navy as a submariner, and I've been rather intimately involved with communications networks since around the age of eleven. You might be surprised to learn that I applaud Snowden's revelations regarding pervasive NSA surveillance of American citizens at home, abroad, and in interaction with allied nations. I doubt you have the depth of experience or context to fully appreciate why I applaud it, though, given your choice of the word "stole" to describe the materials in question. I prefer the term "returned," or perhaps "disclosed," as in "disclosed to the American people what their government had been doing in violation of their own Constitution," a document I swore an oath to uphold and defend against all enemies, foreign and domestic. Again, I doubt you truly understand what that means.