Ok, after digging into the archives, three more have at least 200 points, 80 rebounds, 30 assists and shooting 45% from the field or better in first 21 games (could only go as far back as 1989-90):
Caron Butler - 285 points (95/208, .457), 134 rebounds, 63 assists (and this is only in 18 games since he was out the first three games of the season)
Ray Allen - 278 points (104/193, .539), 84 rebounds, 39 assists
Nadav Henefeld - 224 points (79/159, .500), 129 rebounds, 59 assists
There were two other freshmen that came close, but missed the 45% cut:
Rudy Gay - 233 points (84/188, .447), 129 rebounds, 31 assists
Donyell Marshall - 216 points (81/194, .418), 103 rebounds, 34 assists