Take a look at just LaVell's time frame.
Last 10 years LaVell was 5-5 against Utah while they had a .607 (71-46) winning percentage. Which is still significantly lower than their last 10 years at .691 for Utah.
In his first 19 years LaVell was 17-2 while Utah had .439 (93-119-3) winning percentage.
Back to the point...during a time when MANY teams owned your rival you should also own your rival.