New Chiefs receiverXavier Worthy might not be as fast as he was back in March, when he blazed to the NFL Combine record for the 40-yard dash. But by Wednesday, he said a hamstring injury that limited him through OTAs was healed. And that’s a very good development for the Chiefs, who selected Worthy with the 28th pick of April’s NFL Draft. The two-time defending Super Bowl champs started training camp Wednesday, with KC quarterbacks joining all the rookies at Missouri Western in St. Joseph, Mo. “It felt good just to be back out here with the guys and being able to play football again,” Worthy t…