This is an opinion from another site; the site is listed below;
Blevins is part of a sort of trilogy within _ATPH_. John Grady represents the cowboy figure, refusing to die until _COTP_. Lacey Rawlins is a sort of reality check for both the reader and for John Grady--he says something about thinking that he and John Grady think that they're "a couple of pretty tough cowboys" who are really living a myth. So you have the reality and you have the myth. Where's Blevins? For me he represents a choice that McCarthy is posing to American culture. Blevins makes a free choice to return and steal his horse, and he pays the consequences--he dies.