Spring Football Preview - Storylines Part 2 Posted Mar 8, 2016 UNC's run defense can be cited as the one major weakness for the Tar Heels in 2015. According to reports, defensive end Junior Gnonkonde will not be back after graduating and Jeremiah Clark is not enrolled at UNC this spring (his potential return is unknown). The Tar Heels still have players with a wealth of experience who will look to step it up in 2016. (Carolina Blue)