Spanish-language media giant TelevisaUnivison unveiled a surprise overhaul of its ad-sales structure Monday — with just weeks to go before the TV industry opens its annual “upfront” marketplace. The company replaced Tim Naividad, who had been in place since June of 2025, with a veteran internal choice, John Kozack , who has worked at TelevisaUnivision over two decades. Natividad had previous experience at Roku and Amazon, and his digital chops were no doubt welcome at a traditional media