Passing is compared because it is where the two of them have taken the most snaps between them; a player with no passing work reads as zero, which is what he did. Bars are scaled within each row, so length compares the two players on that stat only and says nothing across rows. These are two different seasons, so some of every gap belongs to the years rather than to the players.

The same phase with volume divided out. These are rates rather than league percentiles, so no rank is implied by any of them.