One thing about some of these QBs, like Lawrence, is they haven’t faced adversity. TL lost 2 games in three years in HS, and one in college to date. Clemson dominates most opponents. He didn’t look ‘all time great’ against LSU, but did lead a comeback down 16-0 Ohio State.
Assuming he’s a day one starter at Jacksonville, Lawrence will lose more games in his first eight starts than his high school and college years combined.
Pat Mahomes and Aaron Rodgers weren’t on powerhouses at Texas Tech and Cal, so you could at least try and gauge mental toughness in games. Rodgers was the primary reason Cal was a top 10 team his last season.