I tend to not put much thought into replacing players at the college level. Since most players are only starters for 2, sometimes 3 and on a rare occasion 4 years, players are constantly changing. Teams will forever be replacing players. Sometimes the replacement is unknown and ends up filling the void, sometimes the replacement is worse, but the surrounding cast is better as a whole and is able to make up for the deficiency. Then consider the number of players, with starting experience that are returning, and how that experience can fill the void of losing good players. I tend to look at schools that are annually solid defensive teams, they don't always have 11 of the best players in the country on the squad. You have to look at the sum of the parts. In Nebraska's case, are the edge players going to be better this year? Will the LBs be better? I believe that the improvement in those areas are going to counter the losses on the defensive line, even if Jeudy and Van Poppel aren't quite as dominant as Hutmacher or Robinson were.