Yankees prospect Dax Kilby made his delayed season debut on Thursday, as he began a rehab assignment with the organization’s Florida Complex League team. The young shortstop, coming back from a hamstring strain, led off and went 0-for-2 with a strikeout in his return to game action. He also flew out to left. Kilby, the third-best prospect in the Yankees’ farm system and the 70th-best in baseball, per MLB.com, suffered his hamstring injury back i…