BFD.
We already knew that McCain (the mule) gave the dossier to the FBI and we already knew that the FBI knew about the dossier even before McCain gave the FBI the dossier.
So McCain (the dupe) was just being used by the Deep State as a misdirection.
Add to that, McCain is now dead, and the Deep State powers on!
I would have gone with
(the co-conspirator)
but that’s just me.