SANTA CLARA, Calif. — The Green Bay Packers have one Aaron left, and how he fares will go a long way toward determining if they can upset the 49ers Saturday night. When Aaron Rodgers went from future Hall of Fame quarterback to a weekly sideshow before being traded to the New York Jets, the Packers were pleasantly surprised to see Jordan Love perform at something approximating a Rodgers level — at a much smaller price tag and with a lot less drama. Truth be told, Love didn’t truly kick into gear until running back Aaron Jones got healthy enough to balance the Green Bay offense. It turned the P…