Kenpom's role levels are more about usage rate than minutes. Usage rate is how many possessions a player "uses" while he's in the game, defined as ending the possession in either a field goal attempt, free throws, or a turnover. So what that number is actually telling you is that Ticket is fairly passive, and Justyn is more aggressive. The number is calculated using only possessions the player is on the floor, so time missed won't factor into it.
You opened up a big can of worms Brian. We're gonna turn you into a nerd!
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