In all sincerity, I do not see the relevance of this either. If the chair and the vice-chairs are away, how can the chair name a replacement? I do not see that the motion is relevant.
Evidence of meeting #1 for Citizenship and Immigration in the 40th Parliament, 2nd session. (The original version is on Parliament’s site, as are the minutes.) The winning word was chair.
A recording is available from Parliament.