Spree is more likely of a candidate than KG, IMO. KG was a great player and could beat other Forwards off the dribble, but I never felt he was skilled enough as a pure ball handler to play some Point Forward. I looked up the Roster on B-R, and it has Cassell listed as PG, which I thought was right because I remember him being the missing piece. They brought him in as the floor general with 2 championships on his resume and he brought it all together.Pretty sure I remember him playing point guard in some playoff games. But maybe it was Sprewell...
(roster/stats if anyone is interested: http://www.basketball-reference.com/teams/MIN/2004.html)