Linebackers have passed through one after the other on their way to the NFL. The secondary has been made over several times. There have been three coordinators in the past three years alone.
Through it all, the University of Wisconsin football team's defense has remained one of the nation's best.
Connect the dots and you'll find the one constant in UW's spectacular run of defensive success has been the corps of down linemen, a sturdy, more-athletic-than-you-think group of team players who have anchored the defense for what seems like forever.
Senior ends Conor Sheehy, Chikwe Obasih and Alec James have been fixtures in the line rotation for four years, combining for 84 starts.