Sure USU built from scratch this year, but he did bring 2 key players with him so there is some familiarity and carryover there at least with the coach.
But outside of USU, the other top teams in this conference all had a lot of carryover from previous year(s).
Your point is valid that Many teams in college basketball are dealing with a lot of turnover. Part of the reason the overall product is declining and that there is inconsistency all over the place this year in college basketball.
Kevin has relied heavily on short term players, moreso than the rest of the conference, and his few carryovers have had injury problems (Cottrell, Nowell) or hit random senior slumps( Webster), or you are JJ3. I would argue that year 3 would have potentially been better if we had more carryover players, especially starters. People have criticized the idea of building a team and clamored for a "win now" approach. That is what Kevin has done in terms of roster construction given the starting 5 is almost all new players each season.