It didn't matter how big of a lead the Miami Dolphins built on the Kansas City Chiefs. It still wasn't enough to keep them from feeling jittery. One of two winless teams left in the NFL, the Dolphins came into Arrowhead Stadium on Sunday with the cloud of two second-half collapses still hovering. They were also facing a Chiefs team that had mastered the art of the comeback: 0-3 to 4-3 in four games. So it made sense that nobody on the Dolphins sideline was celebrating until the final seconds ticked away, and coach Tony Sparano's beleaguered team could finally enjoy a 31-3 victory.