They're very related—no doubt they're related—but if you put them all together and try to resolve them all with any one group or single approach, you're not going to end up solving any of them.
It seems to me that a committee of the Parliament in Canada is going to be most able to do something about the Canadian tax system and perhaps operate in an international forum, but those are two different approaches. It does seem to me appropriate to think separately about each of them.