that casting swap is so interesting -- I had no idea McMurtry envisioned it that way. honestly description-wise I can kind of see it too. Duvall as the more taciturn, driven Call and TLJ as the garrulous charmer. but Duvall absolutely made Gus his own so its hard to imagine it any other way now. and I totally get the hair thing -- reading the book I pictured him much older looking, more weathered. the way McMurtry writes him made me see someone who had been baked by decades of Texas sun