Dan Campbell told Amon-Ra St. Brown, Penei Sewell, Jared Goff and several of the Lions’ leaders that it is their football team. With leadership comes the opportunity to pass down lessons and to set an example of the work needed to reach the pinnacle of success in the National Football League. After the first day of Lions training camp, a select number of players remained after practice to work on the JUGS machine, just like St. Brown, the team’s star wideout. Among them was undrafted rookie free agent wideout Isaiah Williams. Admittedly, he is not the type of individual seeking glitz and glamour. The culture of grit and hard work fits right in with what the talented wideout is seeking from an organization he plays for. The additional work put in, starting right away in the spring, is paying off in his pursuit of learning the offense and emulating the hardest-working players on the roster. “It means everything. I’m on an uphill battle to make this team,” Williams told Lions On SI after…