As a person who was raised in a staunchly devout LCMS home by 2nd generation German immigrants (Grandparents came to America in 1920, after The Treaty of Versailles stripped them of all property). While any Christian dialogue with another denomination is positive, actually discussing "sister Church" status must be view very skeptically; after the 1997 "Deal with the Devil", and more historicly, what Philip Melecheton did to Lutheranism by allying with the Calvinist following Martin Luther's death in 1546. I believe the LCMS should take the same spiritual stance, trusting in God Almighty, that Luther did at the Deit of Worms in 1521. We should concord nothing our Lutheran for Fathers complied by inspiration of the Holy Spirt, in the Book of Concord.