In the course of the investigation, Bar Counsel may request complainant, respondent, or any other person who may have knowledge of pertinent facts to provide information concerning the matters under investigation. Bar Counsel, however, shall not contact a client of respondent when that client is not the complainant without first obtaining the consent of respondent or, failing that, the consent upon a written showing of good cause of a member of the Board designated by the Chair for that purpose. The preceding requirement for consent prior to contacting a respondent's client who is not a complainant shall not apply when Bar Counsel believes the client has knowledge of a matter under investigation in a docketed case. Disclosures necessary to Bar Counsel's investigation shall not constitute a violation of the confidentiality rules.