Sixteen years after its last tussle on the football field with De La Salle-Concord, Mater Dei-Santa Ana is sending in big brother to finish off the fight. The Monarchs (14-0), blessed with perhaps the best quarterback, offensive line and core of receivers of any high school in the country, look primed to end a four-game losing streak to the Spartans (11-1) that began in 1998 when they meet in Saturday’s CIF Open Division bowl title game at Sacramento State. If it does so, Mater Dei, No.