Unless this leak was part of that very protection arrangement, or part of some larger play. It's possible Snowden had all this stuff and the timing works out (right?). And let's not forget the mysterious "it's time" tweets from Snowden a few weeks ago.
Edit: I don't know why I'm being downvoted here. Isn't this a plausible explanation until we have more evidence?
Snowden worked at the NSA and took a bunch of stuff. These leaks are from that time period. This isn't crazy.
Edit: His "it's time" tweet happened less than 48 hours after the first TheShadowBrokers account (reddit) was created, prior to activity. Those accounts were dormant until the drop.
It's also possible the timestamps on the files match up to Snowden's leaks because the NSA stopped using that server / etc.
But the "it's time" tweet seems to imply Snowden may have known this was coming. It could also be a conincidence, of course.
Edit: I don't know why I'm being downvoted here. Isn't this a plausible explanation until we have more evidence?