They lost their LB's, a good chunk of their OL, and several other key players last year. Do you see a massive drop off
in those areas?
They'll lose their 3-year QB. No one would suggest that that won't be an adjustment. But they have a 4-star QB who transferred to Utah after Tuttle left.
They will lose Moss. They still have several RB's who would start at any other team in the state.
Most of their WR's will be back.
Etc...
When you have a good coach, and solid depth, you don't see a tremendous drop in performance.
Utah lost an award-winning kicker and punter last year. The replacements aren't great. But the rest of the team's strengths have compensated for that weakness.