The Nats went 26-15 when he was out in August and September, a .634 winning percentage.
The rest of the season they had a .587 winning percentage.
Weren't we mostly playing September callups of our weak NL East foes? I don't think that proves anything. How did his replacements do compared to the numbers Harper put up? Can we find anybody to put out in RF that will hit .319/.416/.562?
