How about his numbers against UCF, which both obscure quarterbacks you listed also played against
Hackenberg - 21/28 (75%) for 262 yards, 1 TD, 0 INT
O'Korn - 24/46 (52%) for 231 yards, 1 TD, 2 INT
Walker - 26/44 (59%) for 382 yards, 4 TD, 1 INT
Another true freshman QB also played against UCF.
Burcham - 24/34 (70.6%) for 222 yards 1, TD, 0 INT.