re: So the DNC Server is Clearly Not Important to the Investigation

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IS there a way to ID the hackers after the fact? after the hacker has come and gone?

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You can when they reuse command and control servers and malware.

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But some of the most compelling evidence linking the DNC breach to Russia was found at the beginning of July by Thomas Rid, a professor at King’s College in London, who discovered an identical command-and-control address hardcoded into the DNC malware that was also found on malware used to hack the German Parliament in 2015. According to German security officials, the malware originated from Russian military intelligence. An identical SSL certificate was also found in both breaches.

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LINK

Edit: not sure I answered your question but I hope you find the info helpful.