You make the assumption that they are not terrible. If they are terrible, we are screwed. However, I think it is much more likely that they are at least average players. In order for there to be a big drop off, there has to be an originally high ceiling. I wouldn't say our senior Dlinemen are irreplaceable or any kind of standouts, would you? I doubt any of them get even honorable mention. Maybe McDonough could get a 3rd team or honorable mention I guess. Also, if our seniors were that good, we wouldn't rotate 12 linemen in. Our coaches don't have the elite talent other teams in the B12 have, so they try to gain an edge by building depth. It's a pretty good strategy. Depth plus discipline on the line creates an environment where new guys can step in and contribute without being incredible athletes and keeps the line consistent from year to year.