He was definitely well-suited for the role. I don't think anyone else could've done it that well.
Wife realized that one of the MAs that works at her clinic has a baby-daddy named McCrae. His brother is named Augustus. She wondered about that and asked the girl, and yes, their parents named them both after Duvall's Lonesome Dove character. Don't know about Augustus, but McCrae, I'm afraid, isn't adding much good to the legacy of that name.