By Joseph McBride Former Welsh rugby star Louis Rees-Zammit has agreed to sign for NFL champions Kansas City Chiefs, and is expected to make it official on Friday. Rees-Zammit held visits with the Cleveland Browns, New York Jets, Denver Broncos, and the Chiefs after his Pro Day showing, where he fan a 40-yard dash in 4.44 seconds. At six-foot-three and 200 pounds, Rees-Zammit is a powerful athlete but turned heads when displaying his lightning speed in front of team scouts. The 23-year-old was already an established Welsh rugby international and also a star for Gloucester, and shocked fans whe…