At any stage of a proceeding the Court may order that:
(a) a person who is not a proper or necessary party, whether or not he was one originally, cease to be a party;
(b) any of the following persons be added as a party:
(i) a person who ought to have been joined as a party or whose presence before the Court is necessary to ensure that all questions in the proceeding are effectually and completely determined and adjudicated on; or
(ii) a person between whom and a party to the proceeding there may exist a question arising out of, or relating to or connected with, a claim in the proceeding which it is just and convenient to determine as between that person and that party as well as between the parties to the proceeding; or
(c) a person to whom paragraph (b) applies be substituted for one to whom paragraph (a) applies.