Unfortunately for you - Game logs exist in the NFL.
Bailey Zappe stats courtesy of
ESPN
vs Green Bay 10/2 107.4 rating,
vs Detroit 10/9 100.0 rating,
vs Cleveland 10/16 118.4 rating
vs Chicago 10/24 [worst game] 67.4 rating
Season Rating 100.9
Mac Jones stats courtesy of
ESPN
87.2, 79.7, 62.1, 16.7, 79.9, 89.2, 104.6, 119.8, 84.8, 75.3, 52.1, 105.6, 98.6, 75.3
Season Rating 84.8
I'm not a math major but
100.9 > 84.8.
Mac Jones had the lion's share of opportunities because of his higher draft status but clearly got outperformed by Zappe in terms of actual game performance ratings.