There seems to be a clump of teams in the Big Ten ranked from 4 to 8 that can all beat each other when they are at home.
USC has 2 good wins at home over Mich and Iowa, but lost on the road to Illinois
Michigan has lost @USC and beat Wash at home.
Illinois has beat USC at home and lost to Wash on the road.
Washington has lost to Mich on the road and beat Illinois at home
Iowa has lost to USC on the road.