It's a very good question. I don't think it's right to leave him out if you're honoring McPherson and McNabb. McPherson may have had the best single season, and McNabb had obviously the best pro career and was the best overall player of the 3. But you can make an argument that Graves had the best college career. If the senior season team wasn't such a flop, there'd be no argument.
I really don't think you can leave him out.