DCLeaks and Guccifer 2 are allegedly Russian disinformation operations, but I think it is more likely they were domestic disinformation operations. Obviously, I don't know the full truth about Seth Rich, but I don't see how DCLeaks has any bearing on the question of who supplied the DNC files to WikiLeaks (since I certainly do not believe Muller report account which has them being transferred to WikiLeaks just a few days before they were published, whereas Assange indicated in mid-June that the files it planned to publish were already in its possession).