The cornerback position was one of the San Francisco 49ers' more evolving, fascinating positions in 2013 and promises to be interesting as the team builds its 2014 roster.It wouldn't be a surprise if the 49ers use a high draft pick to develop a young player at the position. Let's take a look at the players at the position from the 2013 team and where they stand.Tramaine Brock: He has the most clarity of any cornerback on the roster.