(2) For an association with articles or bylaws requiring more than two-thirds of the votes cast or other conditions for approval, a proportion of the votes cast or a number of total members as required by the articles or bylaws and the conditions for approval in the articles or bylaws have been satisfied. After the plan has been approved, the chair, vice-chair, president, vice president, secretary, or assistant secretary of each association merging shall sign the articles of merger which shall also be signed on behalf of each other entity that is a party to the merger.