Kammala jumla mai zuwa: Rosa ya fara aikinsa ta hanyar ciyar da yanayi biyu yana wasa da Wexford Raiders na OPJHL. Daga nan sai ya halarci Kwalejin Merrimack daga 2000 zuwa 2004. An zaba shi a zagaye na 8 na
2001 NHL Entry Draft (255th gaba ɗaya) ta Dallas Stars.