Here is an excerpt from the interview:
Collider: What is your character like, obviously he is a mentor to John.
Timothy Olyphant: He plays John’s guardian, his sole purpose is basically to keep him alive and train him so that he can fight his own fight.
Collider: Have there been any hints from D J or the writers about subtleties of your character that may be in the book that may not be obvious in the movie?
Olyphant: Basically the process was when he was getting me to, when I read it I had a very specific take on what I would like to do with it, I had that conversation with DJ and we were on the same page about what I was talking about and we just kept poking around in that area, we talked about the book a little bit in terms of the source material and what was to important to honor, because I am not in the know in terms of the novel on occasion if I have an idea, it occurs to me that we have a source material that I don’t know if I am going in that direction. If I have an idea that goes outside of what’s on the page and I say “you know I know it’s not in the script but here is what I would like to do. I also need to ask and how does that relate to the book and obviously even though I haven’t read the book, others have and I am in a position to be able to ask the questions.