Either way, Aldo ultimately decided on June 30 he couldn't fight at the level he wanted to against archrival Conor McGregor and withdrew from the heavily hyped featherweight title match that was to headline UFC 189 at the MGM Grand Garden. And then on Monday, jaws dropped when the company announced that lightweight Gilbert Melendez, of all people, tested positive for steroids – yes, testosterone is a steroid – following his bout in Mexico City last month against Eddie Alvarez. The outspoken McGregor has a chance to undo a lot of that damage Saturday when he faces Chad Mendes for the interim featherweight title.