Because you secede all of the UK into a new nation and the King leaves so you're left a alone. If it was up to me it should be at least a puppet
You're supposed to then switch over into the UK. Why would Canada be above the UK?
On a related note, I would humbly ask the team to consider adding the following Entente events:
An event with the option for Canada not to release New England, and instead hold on to it. If AUS, CSA, or MacCarthy USA controls the former US, then Canada gets cores on Alaska and New England. If Democratic USA wins, Canada will incur massive penalties for keeping New England, and to a lesser extent, Alaska.
Also, an event after the liberation of the UK by Canada: The Future of the British Empire.
This event would determine the political structure of the empire and how centralised, Anglocentric, Ethnocentric, Racist, Tolerent, inclusive, etc., it would be. It could range from one united empire, to the dissolution of the empire as political structure. I detailed one option earler, if you are interested, I could elabourate.
Finally, an event giving Nationalist France it's provinces if an ally annexes CoF. I don't think such an event is in place, though it may be.
Oh, and you've already got a great mod, probably the best I've ever played, so thank you for that.