Not developed during Monty's tenure:
Marcus Thornton
Aminu
Ayon
Henry
QPon
Darius Miller
Austin Rivers
Withey
PJax
Russ
I'd also argue Robin Lopez
All of the young talent we have was developed by other teams. We haven't had any young kid we draft come up and play any significant role well other than AD.
I also realize the natural argument of "well PJax and Russ never went and did anything," but I look at that from the other perspective of Monty being partially at fault for that. Simply put, we do not develop and play young talent.