You seem a bit stuck on this thing about there being 17 agencies.
It was a DNI statement on behalf of the 17 agencies of the intelligence community. That means none objected to it. For the purposes of that statement the most important were the NSA, the CIA and the FBI. The FBI took longer to sign off than the others because they weren't initially convinced about the part that says the aim was to get Trump elected. They didn't have any problems with the part about Russian meddling in the election though. Apparently they got some additional Intel because they signed in the end.
This is way those three agencies have this logo on the statement, along with the DNI, but the coastguard didn't.
It was a DNI statement on behalf of the 17 agencies of the intelligence community. That means none objected to it. For the purposes of that statement the most important were the NSA, the CIA and the FBI. The FBI took longer to sign off than the others because they weren't initially convinced about the part that says the aim was to get Trump elected. They didn't have any problems with the part about Russian meddling in the election though. Apparently they got some additional Intel because they signed in the end.
This is way those three agencies have this logo on the statement, along with the DNI, but the coastguard didn't.