I am not sure if your argument is any stronger, as I have no idea who those guys are that are emphasized below.
Just because he is "better than other irrelevant players" doesn't mean RB's hasn't been an extreme underachiever compared to his potential.
I often hear announcers or someone from the public say a guy should have won MORE but I rarely hear them say who should have won LESS. Even in my own mind, Corey Pavin may be the only player who I thought should have won less than he actually did.
Barnes tuned pro in 2003- looking at the 2002 US Am and NCAA results, it seems like he has not done as well as guys like Bill Haas, Hunter Mahan, Graeme McDowell, Nick Watney and Ryan Moore
but I think he has had a better career than David Miller, Justin Bray, Justin Smith, Justin Walters, Adam Rubinson, Matt Anderson, Michael Beard, Ramon Bescansa, Shiv Kapur, John Klauk, James Lepp, etc.