Two players, same team, the 1980 A’s

Rickey Henderson: .420 OBP, .399 SLG = .819 OPS
Tony Armas Sr.: .310 OBP, .500 SLG = .810 OPS

Pretty close OPS, completely different level of contribution. Rickey created 7.1 runs a game and had a .691 offensive winning percentage. Armas created 4.9 runs a game and had a .533 offensive winning percentage. A team of Hendersons, with average defense and offense, would have won 112 games in a 162-game season; a team of Armases 86. Some of that’s the stolen bases, obviously — but most of it is the giant difference in on-base percentage.

Open thread.