Since I included real recruits in the game, here is a list of actual recruits that will be returning next season.
Class of 2021 (Based on 24/7 Rank)
SF Patrick Baldwin Jr., Milwaukee
PF Caleb Houstan, Michigan
SF Peyton Watson, UCLA
SF Kendall Brown, Baylor
PG Tyty Washington, Kentucky
C Daimion Collins, Kentucky
C Moussa Diabate, Michigan
SF A.J. Griffin, Duke
SG Max Christie, Michigan St.
SF Max Cleveland, Florida St.
PF Brandon Huntley-Hatfield, TN
PG Nolan Hickman, Gonzaga
SF Jaylon Tyson, Texas
SG Malaki Branham, Ohio State
SG Langston Love, Baylor
SG Kawacie Reeves, Florida
I didn't include any freshman from the Big East because the entire recruiting classes were included for each team (Kaluma, Nembhard and Alexander at Creighton, Hawkins at UConn, Mohammed at Georgetown, etc.). I should note that Baldwin was injured for most of the season and that's probably why he chose to return.