I'll try this again.
The days did not prove what they suspected. However, it was evidence of a possible link between Trump and Alfa Bank. Further investigation was, in their minds, needed to substantiate their suspicions.
Joffe et al lacked the resources to do the investigation. That is why they took it to the FBI.
fwig, the FBI neither confirmed nor refuted a Trump - Alfa Bank connection. They don't know what the evidence pointed to. Could've been white noise, marketing spam, a Tump - Alfa back channel, something else.
Did you read The Federalist article about the GA Tech dude? Yeah, I know it is the Federalist, but they FOIA'd his emails....The argument is that this guy picked the data they had apart, and the white papers built around that data, and said it does not "prove" they communicated. But sure, if you are not a tech expert like me, it can pass the initial smell test.
I get that the white papers were to be used to bootstap the limited data they had to convince some journalist to get the ball rolling. Why give those white papers to the FBI though if your own guy is telling you that your data is insufficient to actually prove X?
Maybe shit like this has been going on so long, and the FBI throws it in the X File, that Sussman thought nothing would come of it. I guess we will find out if there is a trial.
Can Dunham even prove the negative - that no communications took place? Who knows?