Former Denver Broncos assistant offensive line coach John Benton, former New Orleans Saints assistant coach Stan Kwan, former undrafted free-agent DT Vince Oghobaase (Duke) and former Houston Texans OT Adam Stenavich were added to the San Francisco 49ers’ coaching staff Tuesday, Feb. 21. Assistant coach Michael Clay will serve as strength and conditioning coach. Benton, Kwan, Oghobaase and Stenavich will serve as offensive line coach, assistant special teams coach, assistant defensive line coach and assistant offensive line coach, respectively.