I think you assume that all players can be developed. Some players reach their peak in HS or shortly thereafter. Some players don't reach their full capabilities until their 3rd or 4th year in college. Some sadly just never do. UCONN and all schools have had examples of all over the years. More PT isn't necessarily the answer.Was the bench being developed? No.
Without identifying by name there are some who will just never advance beyond a certain level regardless of the minutes they get.. This is just one of the difficulties in recruiting; projecting player growth even with the best of coaching.