With 100 points to assign to rivals, BYU gets 64.4, but then the second highest (10.2) goes to USC, with Colorado (7.1) and Utah St (4.6) the next two.
For BYU, Colorado, and Utah St, slightly more of those fans consider Utah a rival than Utah fans view them as a rival.
But USC pretty much doesn't have Utah on the radar as a rival at all. They only gave Utah 0.5 points