It was not a complete across-the-board year, it was a fifth year granted to former JUCO athletes who have currently not used up their 5 year clock. So if they previously redshirted, they were not granted the fifth year.
Jack Van Bebber and Conrad Caldwell were both undefeated for their career and 3X NC at consecutive weights at Okie State (A&M). Gonna be hard to beat that.
It doesn't answer the question asked. If we ignore the "D1 podium" part of the question, then John Peterson has to be mentioned. 1X NAIA placer who then became an Olympic Champ, Olympic Silver, World Silver, World Bronze