Anthony Davis' recent shoulder surgery likely will keep the 49ers' right tackle out of most or all of the team's spring drills. The silver lining? It will give coaches a better opportunity to evaluate the intriguing mix of players vying to be the team's so-called "swing" tackle this season. San Francisco 49ers tackle Anthony Davis walks off the field after the Baltimore Ravens won the NFL Super Bowl XLVII football game, Sunday, Feb.