I see you point, but the personnel we replaced them with is not the same quality they replaced with. Our 3 front was so good because of Gub (down that stretch he played almost every series which was unbelievable ) and took on two every play with very good LB's filling holes, not so much this year. We may not see another Gub level guy for years and years. A DT getting player of the year in a conference is so hard to do because of stats but opponent coaches saw what he did for the team success. Riley Wilson is still a stud but teams now seem to know he will be the blitzer to scheme against where as last year others LB's could get home as well (Hill specifically). Tirrell and Kaho have each only 1 sack in 7 games. I do see a high ceiling with Otlewski. I also think the loss of Edwards is a major factor in both pass rush and holding the edge. Harris is doing well but both of them on a team makes a huge difference rotationally.
Oline I think we really miss Forbes in many ways. I am also very impressed with MSU line play despite losing 2 studs. They seem to execute so well and playcalling I think is way better than under Houseright/DUI utilizing what their strengths are. Hopefully UM's new guy can get "his guys" in here and have a chance to develop them so we can get away from needing portal guys to fill holes every year.