Getty Jaquan Brisker is set to hit free agency. Heading into the new league year, the San Francisco 49ers have a few question marks regarding the back end of their defense, especially at safety. The Niners have a few solid young pieces in Ji’Ayir Brown and Malik Mustapha, but considering how strong the upcoming free agent market will be at the position, it might behoove San Francisco to add another young DB to the group. Mike Masala of Niners Wire thinks the 49ers should let Jason Pinnock walk