I looked at how FP and RRF affect performance for middle infielders
here. Basically, until you hit D-- range, it has little effect.
In the OF very high RRF can net you quite a few + plays, but FP shouldn't be overlooked. For example, when factoring in errors, '84 Kirby Puckett is nearly as good a fielder as '73 Billy North, despite the .12 difference in RRF.