Why most sedevacantists regard Thuc as an archbishop? Indeed it is known Thuc was appointed for an archbishop of Hue by Roncalli [whom sedevacantists reject as Pope]. And why did Thuc regard himself as an archbishop until the end? He even signed his 1982 Declaration on sedevacantism by the title of the titular archbishop of Bullae Regiae, which is from Montini [another man sedevacantists reject as Pope]. Can someone explain these? Thanks.