I am not an expert on parliamentary structure, and I am not familiar with all the levels. For example, to avoid mixing legislative and executive powers, consideration may have been given to appointing a director of the new service who is not an active member of the RCMP. Actually, a retired member or a member of another department could have been appointed to head the service. So there would be no risk of mixing executive power with legislative power.
On May 28th, 2015. See this statement in context.