Kyle Shanahan: 49ers “obviously made a mistake” signing De’Vondre Campbell

The 49ers have suspended linebacker De'Vondre Campbell for the rest of the season after he refused to play on Thursday night, and coach Kyle Shanahan is acknowledging that in hindsight he wishes he'd never brought Campbell to San Francisco in the first place.Playing for the Packers last year, Campbell seemed disgruntled, and when Green Bay cut him this offseason he badmouthed the team. Shanahan was asked today if the 49ers thought about those issues before signing him. Shanahan said the 49ers knew about the red flags with Campbell but were desperate to sign a linebacker after Dre Greenlaw had torn his Achilles tendon in the Super Bowl."Yeah, of course," Shanahan answered. "We look into all that. It was tough losing Dre. We knew we were going to need a starting-caliber linebacker. We had two guys that we thought we had committed that we lost in free agency. Then another guy got cut after that and became available."Shanahan said his own experience with Campbell on the Falcons and conversations he had with others in the league who knew Campbell made him think things would be OK."I was with De'Vondre his rookie year in Atlanta, so I knew what he was capable of," Shanahan said. "Not...