*** w73 5/15 pp. 319-320 Questions From Readers ***Is there a difference, then, between these "marked" ones and persons who may have committed serious sins but who were not disfellowshiped due to their sincere repentance? Yes, there is. True, these latter ones may have been publicly reproved, in harmony with 1 Timothy 5:20, but they have already recognized the wrong of their course, felt shame over it and repented. That is not the case with the ones needing to be "marked." It is for the very reason that they are not recognizing the error of their way so as to repent of it that they need to be shamed, and that is why the brothers stop associating with them on other than necessary occasions, as at Christian meetings.
See 1952 version:
*** w52 3/1 p. 144 par. 26 Propriety of Disfellowshiping ***
Well, what if a brother repents before he is disfellowshiped? He may realize that he has done wrong and he knows that the news of his course of action is getting in to the servants. Or he may feel his own shame while no one as yet knows what happened to him, and he goes to one of the mature brothers in the company, maybe the company servant, and he confesses his whole sin. Should that one then be exposed to the congregation and disfellowshiped because the company servant knows his course of action? Not if that person has truly repented. If he has asked forgiveness, and confessed his wrong, and he is changing his course of action, there is no reason why the brother that is spoken to need reveal that brother’s secret to another. His heart condition is right, and therefore mercy, love and kindness should be shown to that individual.
but this:
*** w52 11/15 p. 704 Questions From Readers ***The purpose of observing the disfellowship order is to make the disfellowshiped one realize the error of his way and to shame him, if possible, so that he may be recovered, and also to safeguard your own salvation to life in the new world in vindication of God. (2 Thess. 3:14, 15; Titus 2:8)