‘Both can strengthen their cases this week during rookie camp practices and the Sabres’ three games in the Prospects Challenge, beginning Friday night against the Columbus Blue Jackets. Kulich and Rosen may have been given the weekend off in a normal year because they’ve previously appeared in the showcase and both are important depth pieces for the Sabres, but the unusual training camp – headlined by the club’s trip to Europe – caused general manager Kevyn Adams to add Kulich and Rosen to the roster.’