Its a signature win for Toney, not because Barkley was an A level fighter, but because James systematically butchered Iran that night a la Mayweather-Gatti or Calzaghe-Lacy. It was BRUTAL, and thats the reason that bout is brought up when discussing Toney, and using the comparison from before, the same way a fan might say PBF-Gatti was one of Floyd's signature wins.
..and nobody brings up Barkley as a win for Benn, because when is the last ****ing time we ever talked about Nigel Benn. He's not talked about much, so it never comes up. I love the Barkley/Gatti comparison, very fitting actually, both overachievers who fought anyone, and had a lot of heart and threw a good punch.