The New York Jets waived Isaiah Williams on Saturday, just days after the return specialist fumbled on a second-half kickoff in Monday night’s 27-21 loss to the Miami Dolphins. New York waived Xavier Gipson after he fumbled the ball late in a two-point loss in Week 1 to the Pittsburgh Steelers. Running backs Avery Williams and Isaiah Davis could take over return duties for the Jets in Sunday’s game against the Dallas Cowboys. Williams was signed to the practice squad this week and elevated to the active roster on Saturday. New York signed linebacker Mykal Walker from the practice squad and elevated safety Dean Clark to the active roster.