If Parliament has concerns about the resources allocated by the Governor in Council to a particular tribunal or the degree to which the Governor in Council is interfering in the administration of an agency or tribunal, I think it's a point that's easily overlooked that Parliament can do something about it, but they do it through legislation.
If Parliament wishes to specify that the IRB needs more resources to operate, Parliament can enact legislation instructing the Governor in Council to provide those resources. If Parliament feels that the Governor in Council is interfering with the mandate of a particular tribunal and that there is a lack of independence, it's open to Parliament to amend the legislation to provide measures to ensure greater independence.
I guess if you take nothing away from my testimony other than this, let it be that the role for Parliament in the current system is always on the front end; it's prospective. Parliament provides the instructions, the Governor in Council executes the instructions, and the judiciary supervises that execution.
Parliament does have a role to play, but it's in providing the instructions and empowering the Governor in Council.