For a lot of guys, I think a big part of the improvement was waiting their turn and getting an opportunity. Of course, they needed to put in the work and make the most of it. I remember Laettner saying he loved that you had to work your way up the system at Duke and nothing was handed to you, which is why he was so pissed when Coach K handed the keys to Bobby on day one.
A few people mentioned Boozer and Sanders, but the guy I’d go with from that recruiting class is Dunleavy. Pretty good as a FR, one of the heroes of the national championship game as a SO, and so good as a JR he had to go pro. I remember being shocked with the leap he took his JR year, even playing alongside Jason Williams, who was all-world. Might have been NPOY has he stayed for his SR season.
Shelden Williams was another guy who worked his way up the system. From my recollection, did not come in as polished offensively as Brand and Boozer before him. He and Shav had similar numbers their FR seasons. Shav battled injuries for the rest of his career and Shelden took the leap and ended up with his number in the rafters. Really improved as a low-post scorer, even in a JJ-centric offense, and we all know what he became on defense (the Landlord!).
Cherokee Parks - 5.0 ppg, 2.4 rpg, and Laettner’s whipping boy as a FR, to 19.0 ppg, 9.3 rpg, and a lottery pick as a SR. Another guy who doesn’t get mentioned a lot, since he followed the GOAT and was the main guy on the ill-fated 1994-95 team.