5. Iowa St - sorry Cy, got to be competitive
4. KU - Longest continuous series west of Missouri, last year left bad taste, but one year a rivalry does not make
3. KSU - NU-Snyder was pretty good, but you need two teams, not a team and a coach.
2. CU - Nice guys and the worst fans in the country finish second. Again you need two teams, not one to make a rivalry
1. MU - If we had to pick a B12 North team as a rival I think the only reasonable choice would be Missouri. They are the only team who over many decades have provided the best competition. Rivals are forever - you can have the soup de jour, but not the rival de decade
My $0.02.