Kuithe is barely 6'2" and not even close in career production to 6'5" Bushman. He has a nice 20 ypc ave but only 25 recs for the season.
Bushman, while needing to improve his blocking (if he desires an NFL career), has around 130 receptions in just 3 yrs. Compared to Kuithe's 45 rec in 2 yrs.
Outside of Bushman/TE there's not too many other Y players I'd take over Utah (maybe K Tonga).
Utah is impressive this yr no doubt. That said I don't think they'll deserve or get a playoff spot(in almost any possible scenario). With their weak SOS(compared to the other possible P/O teams), they needed to go undefeated this year.