Inmate P50522 did kitchen duty, bunked with “Figueroa Slim,” Timmons, “Sugar Bear,” and “Big Al” – and got his GED. On Sunday, he is the favorite to be named best supporting actor at the Oscars. If Robert Downey Jr.’s role as the conniving Lewis Strauss in “Oppenheimer” wins him a little bald gold man it will complete the most astonishing comeback in Hollywood. 24 Downey Jr. has been sober for years and has picked up a slew of awards for “Oppenheimer,” including the SAG award last month. Getty Images 24 Rob Lowe told Page Six he always thought he would...