Niners put DL Tank Carradine on IR. Teams knew the knee would take time. SF had extra picks to take him + Lattimore for '14. Good strategy.
NFL.com "The San Francisco 49ers have activated rookie defensive tackle Tank Carradine off the team’s Reserve/NFI list. In a corresponding move, the 49ers released linebacker Jermaine Cunningham to make room for Carradine on the 53-man roster. Cunningham was signed by the team on Oct. 1. Carradine..." October 29
CSN Bay Area "Defensive coordinator Vic Fangio knows nothing more about rookies Tank Carradine and Quinton Dial than the day the 49ers drafted them in late-April. That's because both players remain on the active/non-football injury list due to injuries they sustained during their final college seasons...." August 14