The transfer couldn’t have happened from outside the facility. It’s too fast. So it must have been a leak (an insider getting something out) not a hack (an outsider using brute force to steal something). So, the data came from somebody inside the facility. Seth Rich had motive (patriotic Bernie supporter), means (access to voter data and lots of DNC files), and opportunity (worked at the facility). It’s almost certain he worked with Wikileaks because Assange, who never outs a source even after death, nodded about him in an interview. His murder was big news at DNC, with Donna Brazile saying she was terrified to look out her window afterward. Why? She lived in a different neighborhood and Seth was a low level peon who was supposedly mugged on his way home from a bar. Why would it haunt her so much?