The impact of an undrafted free agent varies depending on the team and the year. Occasionally an undrafted player turns into a star, but more often what we see is eventual solid contributors of the league.
In 2012, there were several notable undrafted players that made rosters and saw significant playing time: Vontaze Burfict, Rod Streater, Brandon Bolden, Leonard Johnson, Mike Brewster and Dezman Moses. In recent years, players like Chris Harris Jr., Victor Cruz, Arian Foster and Dannell Ellerbe have come out of the undrafted ranks.
What makes a successful undrafted free agent? Typically, these players are either amazing athletes, had college injuries, had character concerns, are from small schools or were buried on the depth chart on a great college team.
There will be undrafted free agent success stories in 2013, but the trick is narrowing down a pool of about 500 down to the handful of guys that have a legitimate shot.