If I understood correctly, you are asking me to comment on giving the commissioner an additional mandate, to assess the work of the departments.
The Information Commissioner does it when assessing whether access to information requests are handled properly. The Commissioner of Official Languages does it when determining if departments are complying with the Official Languages Act. Regarding whistle-blower protection, no neutral third party monitors the work of the government and makes recommendations to help the government to improve.
We believe that the Public Sector Integrity Commissioner is in the best position to do this.