Mac Jones is the San Francisco 49ers QB backing up Brock Purdy on Thursday Night Football, not Matt Jones. Purdy is out with a toe injury, and the misheard name confusion is laid to rest: Mac Jones, former Patriots pick who spent last season with Jacksonville, is in the fold. The piece clarifies the Jaguars connection and Patriots draft history, framing the backup situation with fantasy implications for the 49ers’ game plan.