In the book all the pretty horses how does the death of Blevins help John Grady grow as a character?

The main character of All the Pretty Horses, John Grady Cole certainly does not begin McCarthy's novel as a prototypical Western hero. At sixteen, his dream is to run the ranch on which he's lived his whole life. ... With no recourse, John Grady becomes a character in search of a story, a hero in search of a novel.

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Explanation:

He is hypersensitive to mockery and insult, anything impinging on his dignity. This sensitivity led him to run away from his abusive stepfather, and it also leads to his death: he returns to reclaim his stolen horse and gun, and is captured and eventually executed by the cruel captain.Blevins dies, and John Grady repeatedly faces death. But John Grady's own moral survival is conditioned on his continued adherence to his unspoken code, without which his life is not worth living.

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