This. Scheme by far is the big issue. Pass protection is good enough to run an effective intermediate pass game. Run game is a mess but how many teams get great push on predictable shotgun zone runs with no misdirection or constraints?
PFF when grading players doesn’t take into account who that player is lining up against. So a line playing against the 85 bears would be rated poorly, while one playing Savannah state would be top of the list.