I’ve never been fully sold on that. Christmas developed as much as anyone we’ve had and we didn’t have a “big man coach” that played in the paint.
The guys that haven’t developed just weren’t very talented IMO. And I’m talking offensively as I assume most are when they discuss this topic.
I can’t think of one stiff we’ve had that really developed. Stiffs are gonna be stiffs no matter what position the guy coaching them played 20 years ago. You can’t get blood from a stone. You just hope they improve a bit and play smart out there and can clog the paint and get some rebounds. And the guys who I can think of that developed were not a surprise because they either showed some offensive aptitude early and were just raw or caught behind someone better, or were super athletic.(Christmas, AO, Jackson, Melo, Watkins, Etan, Hill come to mind).
Also, I think Chukwu improved a lot in his time at SU. The first time I saw him play he looked Sean Williams level. He became a solid defensive player who occasionally could be effective on offense - much moreso than he used to, at least. Improved greatly at the FT line. Had a few monster games. I think you could have him be coached by the greatest big man coach in the history of the world for 4 years, and he would maybe be very minimally better. He’s just limited in terms of physical talent, beyond being tall. Hard worker and tough kid though whose overall basketball awareness really came along.