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As Cub Swanson nears 15 years competing at MMA's highest stage, the 38-year-old believes his track record stands as testament to his worth.       Related StoriesNearing 15 years under Zuffa banner, Cub Swanson says 'longevity really shows your professionalism' - EnclosureWith win over Stephen Thompson, Belal Muhammad eyes Colby Covington, Khamzat ChimaevMiesha Tate ponders drop to 125 after Julianna Peña 'broke' Amanda Nunes to win UFC gold