With him is a game he played, from the snap counts; without him is a game the team played while he was on its roster and he didn’t.
With him means he was the team’s quarterback that game, at least half of its pass attempts; a game he left early or came into late reads as without him.
Over expected is the team’s average a game over what the season’s ratings expected in each game, the same numbers each measure’s own page reads. “Averages” shows the plain numbers.
Against the line is the team’s margin less the closing line’s, the market’s margin before kickoff, from nflverse’s schedules. A game with no line sits out.