Wikileaks only leaked what they got handed to them. In the DNC case, it seems that the leaker was motivated by Clinton railroading Bernie in the primary. Meanwhile on the Republican ticket, the populist, Trump, was able to sweep aside the established Bush dynasty and other party insider favorites.
This article refers to something occurring in 2014 with State Department email credentials and somehow loosely connecting that with the 2016 DNC email leak.
Besides showing that email is not really that secure in the first place (and evidenced by Ms. Clinton's own maintenance of a personal email server), it doesn't show any evidence that Cozy Bear was behind the DNC leak.
> This article refers to something occurring in 2014 with State Department email credentials and somehow loosely connecting that with the 2016 DNC email leak.
Thanks, that's a good point, I was motivated to read a bit more about it; the article I linked is indeed a bit vague.
The source for it is a de Volkskrant article, I found it in an archive: https://archive.is/S5KeI
This has more detail and contains the claim that the Dutch did observe Cozy Bear breaking into the DNC network.
However, elsewhere we can read that the emails were leaked to WikiLeaks not via Cozy Bear but via Fancy Bear, which is part of GRU; see the Mueller report Volume I, Ill. RUSSIAN HACKING AND DUMPING OPERATIONS, A. and B. page 44-56 in the PDF.
Both the SVR and the GRU infiltrated the DNC network:
"Cozy Bear" had access to DNC systems since the summer of 2015; and "Fancy Bear", since April 2016. There was no evidence of collaboration or knowledge of the other's presence within the system. Rather, the "two Russian espionage groups compromised the same systems and engaged separately in the theft of identical credentials".
From what I've read that's a common way of authoritarian state organization: to prevent any security service from becoming too powerful and thereby becoming a threat to the dictator, there are multiple services with overlapping responsibilities and they compete with each other.
> Assange himself seemed to implicate Seth Rich...
Apparently Aaron Rich's defamation lawsuit got some results: