The Complainant may join in the dispute whoever would rightfully have been a litigant when the case was initially filed. If the Defendant claims he is entitled to have recourse against a company that is not a party to the dispute, he shall submit a written request to the Committee showing the nature and grounds of his claim and shall apply for joinder of such company as a party to the dispute and the Committee may accept or reject this application. In addition, such company may be joined into the dispute upon its request.