Left guard: Quenton Nelson, Indianapolis Colts. Let's talk more about preventing opponents from limiting rushing yards. When evaluating O-line play, it's impossible to know which play a coach has called and, thus, who was assigned to do what. But I can use computer vision to measure how many rushing yards were earned in areas along the line (as in, the gaps) and whether O-linemen near that rushing lane kept opposing defenders away. Running backs gained 2.5 yards more per rush in the areas Nelson was closest to in 2018 than average, which means the Colts rookie's mark is +2.5 yards, the best for any left guard last season. As for passing downs, Nelson was second best among left guards at limiting defenders from coming within five feet of his quarterback (achieved on 22.2% of passing downs). Nelson got better as the season went on and will be a big factor in my Andrew Luck stat projections for next season.