The NFL hasn't wavered in this message to its locked-out players: Get out of the courts and come back to the bargaining table. Lawyers for the league issued written arguments Thursday that a recent legal response by players does not dispel "serious doubts" previously expressed by an appeals court about a federal judge's order that the lockout end immediately. Repeatedly during this dragged-out, employer-employee dispute over the future of this lucrative, ever-popular professional sport, the NFL has insisted the only path to a new agreement is through face-to-face talks.