Every team needs to have a few players become unexpected stars. The Seattle Seahawks seemingly had a player develop like that every year in the early 2010s. Where would the offense have been without undrafted free agents Doug Baldwin and Jermaine Kearse, for instance?
Not all shock stars have to be UDFAs, of course. Head coach Mike Macdonald might be able to mold a defensive player who has somewhat underperformed in his career into a very productive player. Macdonald did that several times with the Baltimore Ravens.
But not all of the surprisingly good players for the Seahawks in training camp have been from the defensive side of the ball.