Xtreme Fighting Championship’s Michigan debut has lost its headliner. Former UFC featherweight  Junior Assuncao (14-5) has been forced to withdraw from his main event against  Daniel Swain (10-2) at “XFC 27: Frozen Fury” due to health reasons. XFC President John Prisco recently announced the news. XFC 27 takes place Dec. 13 at L.C. Walker Arena in Muskegon, Mich.