The 49ers think they know one of their starting cornerbacks. They don’t know the other.
49ers coach Kyle Shanahan said he anticipates Richard Sherman holding onto his starting job.
“Everybody on our team is competing at every position,” Shanahan said, via Matt Maiocco of NBC Sports Bay Area. “We brought Sherm in here to be a starter. That’s what we’re expecting. But his position is no different from every other position.”
Ahkello Witherspoon and Tarvarius Moore, the 49ers’ most recent third-round draft picks, and free agent signee Jason Verrett will compete on the other side. Witherspoon has appeared in 26 games with 21 starts in his two seasons; Moore played 16 games with 12 starts last season as a rookie; the injury-plagued Verrett appeared…