the exorcist: elia kazan reference?

probably sounding like a fool here, but does anybody know what's meant with the reference of elia kazan in 'the exorcist', when kinderman mentions him to karras somewhen in the end?
I also welcome any link to any forum out there where this might have been discussed before.

Because of the movie he directed "on the waterfront" with Marlon Brando
A priest against great odds doing good.But also in conflict over the life he could have lived, if he'd lived mainstream.He would have money for his mother.So check out the story line on that movie it won 8 awards.
Also I think Kazan had died by the time this movie was released,meaning it was a message from God or Merrin to keep going.he was winning.

Basically, this documentary on the life and work of Academy award-winning director Elia Kazan highlights his colorful life on Broadway and in film, which is exemplified by such classic movies as East of Eden,A Streetcar Named Desire, On the Waterfront, and Gentleman's Agreement. Kazan's life outside the movie set is equally noteworthy, and this film utilizes various interviews to illustrate his controversial appearance before the House Un-American Activities Committee in the '50s. Elia Kazan is one of America's most respected directors, and this video provides a unique glimpse into the life of a man who has left a lasting mark on the worlds of both cinema and theatre