.... and was Seth Rich whacked, in part, to cover it up ??

This is a somewhat techy - nerdy read that deals with computer metadata, but it seems that some of the initial DNC hacked files that were first published by Guccifer 2.0 (before WikiLeaks) may have actually been published by Warren Flood (as Guccifer 2.0) to create the "false flag" allegation of Russian interference. Flood was a high ranking IT guy who worked for Obama For America, the DNC, and Joe Biden, and that may be a new or additional motive for Rich's murder, since he had the ability to speak up and allow the dots to be connected, in order to establish that Guccifer 2.0 was a DNC psy-op.

See:

https://www.reddit.com/r/The_Donald/comments/6d9xcm/breaking_ive_found_evidence_that_the_dnc/

And, another technical / investigative article (whole site actually) to the DNC / Guccifer 2 Russian Hack misdirection.

http://g-2.space

I seriously doubt we will ever know what really happened .... but I think one thing is very obvious .... WE'VE BEEN PLAYED.