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RF/9 is a bit deceptive. I mean if one team has a 5 SP group that are not k/9 greats but keep the ball on the ground the infielders should get to more balls than a fielder with Pitching staff that earns more FB, and K numbers. No?
There could also be the fast / slow infield on home games. It would seem that an fast "Astroturf" Toronto ~ Rogers Centre might have an impact vs slower surfaces.
My .02$