You like to throw in variables like Utah running the ball. How about BYU having a banged up sophmore QB? How would have Bushman looked had he been able to play last year with a healthy Zach Wilson etc for a full season? But comparing to Bushman is pointless since he won't be on the team this year.
Kuithe is a great TE, will likely be drafted, looking at the TE groups as a whole and comparing the two i'd lean BYU.