To defend the former pastor also may hook you into the issue. Don't promise to change something. Instead state that you will study the matter. If other members were named in the presentation ask the person if he or she would be willing to meet with that person to work toward a solution. This rarely solves problems, but does waste your time running between two members.
Some disagreements are really a result of difference in perceptions.
Perceptions are best corrected when the key parties meet face to face. Hopefully you don't get to stage two. When the member switches from explanation to persuasion, explore with the member why it is important that you agree with him or her. Here be careful, because the member may answer using emotionally loaded words. These words may cause you to loose the natural position that is so necessary.