Big factor IMO
Fair enough. I would counter with...
1. Rosen barely completed 60% of his passes at UCLA....Mayfield right at 70% at Oklahoma
2. Rosen had slightly better than 2:1 td to int ratio at UCLA....Mayfield right at 6:1 at Oklahoma
3. Rosen never played in a game of consequence at UCLA....Mayfield played in the 4 team playoffs 2 of the last 3 years and a handful of Big 12 championship games.