Well, well: NBC News obtains August 2015 Clinton-DNC memo read this important caveat:

[Eko]

96. I couldnt find anything about keeping a communications

director for the primary, maybe they figured they didnt need one? There is also this,
" Specifically, the DNC agreed to hire a communications director from "one of two candidates previously identified as acceptable to HFA." And while the DNC maintained "the authority to make the final decision" on senior staff in the communications, technology and research departments, the party organization said it would choose "between candidates acceptable to HFA."

The memo stipulates the DNC had to hire a communications director by September 11, 2015, months before the first nominating contests in early 2016.

However, the memo also made clear that the arrangement pertained to only the general election, not the primary season, and it left open the possibility that it would sign similar agreements with other candidates. "

"Still, it clearly allowed the Clinton campaign to influence DNC decisions made during an active primary, even if intended for preparations later.

"Nothing in this agreement shall be construed to violate the DNC's obligation of impartiality and neutrality through the Nominating process. All activities performed under this agreement will be focused exclusively on preparations for the General Election and not the Democratic Primary," the memo states.

"Further we understand you may enter into similar agreements with other candidates," it continues.
https://www.nbcnews.com/politics/elections/memo-reveals-details-hillary-clinton-dnc-deal-n817411

That seems pretty convincing.