I agree in general, but not in this specific case. "He's not a hero. He's just a guy" makes it such that "he's just a guy" is applying specifically to the "he

I agree in general, but not in this specific case. "He's not a hero. He's just a guy" makes it such that "he's just a guy" is applying specifically to the "he's not a hero" bit. I didn't take it as anything more than that, and I don't think the author intended it to mean they believe Graham is just an average person with an average amount of money, power, or influence.