Nolan improved marginally. Boatright's greatest improvements occurred when Shabazz was here with him, though he tightened up his mechanics a bit on his jump shot prior to his senior season.
The overall point is that Ollie was overwhelmed when presented with all of the aspects of running a major college basketball program together. That includes recruiting (i.e. identifying and selling the program to players), building a roster (i.e. filling needs and recruiting to a system and style of play), player development, player management, game-planning, in-game rotation management, and overall game management. Once he had to do all of those things and didn't have guys that came up in the previous administration, the wheels came off pretty quickly.
Just about every program in the country finds a way for inexperienced players to contribute while masking and developing the gaps in their respective games. Ollie failed to do that, and in the process alienated some of his best players.