Every year, on any team, without fail, an undrafted free agent will find himself on the 53-man roster following a great summer of workouts, training camp, and preseason play. Some will find their way onto the final roster due to a lack of depth, winning a positional competition, or simply outplaying everyone else to earn an exclusive spot. The Las Vegas Raiders are in a position to have a handful of those make a push for the gameday roster this fall. The depth chart has some areas that need depth as General Manager John Spytek looks to build the floor of the team during the summer. One player, former N.C. State Wolfpack edge rusher Cian Slone could find himself as the lucky beneficiary of a feel-good story in Las Vegas.…