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Variables
I agree that variables like OBP might change the equation.  An owner might also give FA for certainty if he were in a position to hold onto the guy or platoon him.  Other stats would be important.  If he steals, he can pitch-run.  Is he rated at other positions so he can function as a utility guy?  Does he kill lefties or have a high OBP?
That said, I would probably give an FA 4 for him, on average, if I needed the pt at second.  I would want back no lower than an FA 6, probably a 5.
Dave N