Here's an interview with Julian Assange when asked about the source of the leaks, with direct quotes from Clinton's campaign manager, quoting unnamed experts: https://youtu.be/axuJfX3cO9Q?t=12m50s
"On Sunday morning, the issue erupted, as Mrs. Clinton’s campaign manager, Robby Mook, argued on ABC’s “This Week” that the emails were leaked “by the Russians for the purpose of helping Donald Trump” citing “experts” but offering no other evidence."
http://www.nytimes.com/2016/07/25/us/politics/donald-trump-r...
I mean anyone can quote anonymous "experts" to craft a narrative. Doesn't make it true.