The Dallas Cowboys still don’t know what position best suits Byron Jones after using a first-round pick on him in 2015. Is he a cornerback? Or is he a safety? That continues to be an ongoing discussion at the Cowboys’ headquarters. “That will be a work-in-progress,” executive vice president Stephen Jones said Thursday. Byron Jones has spent the past two seasons exclusively at safety. He started every game last season, being credited with 74 tackles, four tackles for loss, three QB pressures, six passes defensed and one interception returned for a touchdown. He also tied for the team lead with 11 tackles on special teams. Byron Jones played 910 of 1,045 defensive snaps (87.08 percent), the most of any defender. But he regressed throughout the season and split snaps with Kavon Frazier as the season wore on. Byron Jones has shown elite ability at covering hybrid tight ends and bigger receivers, but he hasn’t developed into an Ed Reed-type center fielder at safety as the Cowboys had hoped when they drafted him.