If the DNC were responsible for their own 'hack':
They CHOSE to release embarrassing and damaging information right before a major election, in case they lost, so they would have an excuse if it happened?
And the DNC is so competent at information security that they were able to deceive 17 (or whatever the number is) government agencies and several independent researchers?
WL announces it's going to publish DNC emails. This alerts DNC to leak/hack. DNC decides to get in front of it by playing the whole thing as a Russian op, especially potent as Trump is campaigning on softening stance with Russia. Notice that the first thing G2.0 leaked from the DNC was oppo on Trump.
By the time Wikileaks publishes (without all these Russian fingerprints), "Guccifer" has already carried out the misdirection.
Whole op could be a gambit by the DNC to set the discourse before the content of the emails gets picked up.