Bolo wearers all over the place.
Why did McCain give the Dossier to Comey instead of Brennan or Clapper?
A better question is who gave it to McCain.
Most likely Harry Reid or Flake
To hand it to Brennan or Clapper, it would appear that you were simply giving the dossier to an insider to the White House. I also imagine....that both had already at some point read the dossier (in its pre-stage). Comey was the better choice to make this appear as though he (McCain) was doing some act of law enforcement.
As dimwitted as McCain has proven over the past decade, I don’t think he ever understood that he was just a pawn, and being used.