Gronk: Black should fill the dame. Now White needs a move inside. Otherwise Black a kills. (Anyone see how White can live if Black a? I don't.) Thus Black is one point better off by filling dame rather than just passing.
Bill: This is a rules problem. Some rules may give weird results if you do not fill the dame. The point is that White has to protect. It is not about Black's getting an extra point by filling dame. Time to delete it or change it.