I don't know if Audie had any say so as to who was in his movies, but I also know that several of the "B western" stars appeared in some of his movies. I remember Bob Steele(Column South)(Drums Across the River)(Hell Bent For Leather)(Six Black Horses), Allan "Rocky" Lane(Hell Bent For Leather), Buster Crabb(Arizona Raiders)and Roy Barcroft(Six Black Horses(Gunpoint). Roy wasn't ever a B western "hero", but he and Charles King were considered the two top "bad guys" of the old B westerns. I have often wondered if Audie knew these old stars needed the work, and perhaps asked that they be given some work.
I remember several who later were TV western stars who appeared with Audie. James Arness and Hugh O'Brien are two that come to mind, and there may have been others that I can't think of right now.
Stanford Jolley(Sierra)(Tumbleweed)is another B western bad guy that appeared in hundreds of B westerns. Andy Devine(The Red Badge of Courage)was in a lot of B westerns. Noah Berry(The Cimarron Kid)had a long resume. Walter Brennan(Drums Across the River), Chill Wills(Tumbleweed), Alan Hale, Jr.(Destry)(Bullet For A Badman),Jay Silverheels(Walk the Proud Land)who was of course "Tonto" in the Lone Ranger movies and TV shows, Jack Elam(Silent Passage)(Ride Clear of Diablo), and Jan Merlin(Hell Bent For Leather)(Gunfight At Comanche Creek).
I'm sure I missed some, but thanks to Sue Gossett's book, 'The Films And Career Of Audie Murphy' I think I got most of them. Of course there were many others who had good film and TV careers who appeared with Audie over the years.
"You lead from the front." Audie Murphy, WWII's Most Decorated Soldier