My first published work was in the book now out of print Let Christ Be Christ: Theology, Ethics & World Religions in the Two Kingdoms (Essays in Honor of the Sixty-Fifth Birthday of Charles L. Manske) edited by Daniel N. Harmelink (Tentatio Press, 1999). My essay in the work is entitled, "The Christology of Martin Luther (in The Great Commentary on Galatians of 1531)." Here we examined Luther's christology both in regard the person and work of the LORD Jesus Christ. The research was fascinating and delightful.
After the work came out, Luther Digest: An Annual Abridgment of Luther Studies, Volume 10, 2002 published a good portion of the essay offered in Let Christ Be Christ.
Proper theology is christological! What follows is one of my favorite Luther quotes from his Galatians commentary (Luther's Works, American Edition, Volume 26, pg 280):
He sent His Son into the world, heaped all the sins of all men upon Him, and said to Him: "Be Peter the denier; Paul the persecutor, blasphemer, and assaulter; David the adulterer; the sinner who ate the apple in Paradise; the thief on the cross. In short, be the person of all men, the one who has committed the sins of all men. And see to it that you pay and make satisfaction for them." (Luther expounds on "vicarious" and here explicates Galatians 3:13 which states in Holy Writ: "Christ redeemed us from the curse of the law by becoming a curse for us -- for it is written, 'Cursed is everyone who is hanged on a tree'").