49ers’ Curtis Robinson to replace Tatum Bethune at middle linebacker amid injury

SANTA CLARA — The 49ers head into their Week 12 matchup with the Carolina Panthers without a few players.Tatum Bethune, who suffered an ankle injury in the team’s 41-22 win over the Arizona Cardinals, will miss multiple weeks. The linebacker was seen in the locker room on Thursday still wearing a walking boot but able to put weight on his injured right foot.Curtis Robinson, who took over for Bethune on Sunday, will resume the “quarterback role” on the defense, wearing the green dot and receiving the calls from defensive coordinator Robert Saleh. Coach Kyle Shanahan believes Robinson has already filled in admirably.“It’s been good that Curtis has been here,” Shanahan said. “Always been practicing for this moment, but it’a just like when you’re missing a quarterback or a center. It’s not just the ability of the guy but everything runs through that position. The MIKE by far on the defense, getting everyone lined up, getting the adjustments with all the motions. “It’s a huge deal, schematically, mentally, the challenge of it, but Curtis is the right dude for that.”Rookie linebacker Nick Martin...