Starr was given the other areas of investigation, FBI file, Lewinsky, etc. by Reno.
I don't think Reno gave Starr the authority. A three judge panel gave Starr his authority. Starr was a Special Prosecutor under that now expired statute. Fitzgerald is a U.S. Attorney charged by the AG with prosecuting this case. Big difference between where Starr got his authority and Fitzgerald gets his.