Foge often gets lost in the history of DCs but his career especially in the assistant role is similar to Johnny Ray. While he didn't spend enough time at ND to really evaluate him on that part of his career his major legacy was creating the environment that Barry A stepped into for his two run as DC. FF came in 86 to join Holtz's first staff after being an defensive assistant at Pitt and then head coach being fired after a bad loss to PSU. He was DC for two years and then moved on to an NFL career as a defensive specialist (remember an interview in which he said the NFL pension plan was the reason he left ND). BA was his LB coach in 87 which certainly helped his transition to the next level as knew where the skeletons of the D unit were buried.
It is too bad that ND did not recognize BAs potential at the time Lou was "fired" (in corporate terms his leaving would probably be described as a hostile buyout). Good article that covers his career: http://collegefootballcrazy.com/barry-alvarez-legendary-wisconsin-coach/