Hour 4: Silver & JD wrap up Thursday's show by reacting to the breaking news that the 49ers and Dre Greenlaw have agreed to a reunion on a 1-year, $7.5 million contract. Simultaneously, 49ers defensive lineman Bryce Huff has announced his retirement at the age of 27 on social media. How much football does Greenlaw have left in the tank? The guys discuss it all to close out the show.