We know Mccain laundered the dossier, because the FBI had cut steele as a source.  The reason steele went thru mccain was to provide legitimacy to the debunked claims (IG horowitz told us about how the primary subsources steele referenced had told the FBI that steele mischarachterized his statements.  So after the FBI cut steele off, steele told mccain who kept the play alive a little longer.