Could you elaborate on that?
What do you think "unified and commanded at the highest possible level by Canadian officers" means in practical terms?
I was thinking that would be exactly the objective of setting up Independent Armoured Brigades as an alternative to infantry divisions. So that such Independent Armoured Brigades would be under Canadian Officers, within something like the 7th Army.
Is it your belief that any Canadian formation would needs to be larger (its own Corps-level formation) in order to meet that requirement? Or would Division/Independent Armoured Brigade-sized formations be politically acceptable?
Division level units were obviously acceptable as that was what was initially sent (1st Infantry Division) but the leadership of the Canadian military had been secretly working on plans to send a complete Corps. The best they could get from the politicians was a division at the moment but they weren't going to split it up.
It should be remembered that Canada saw itself as an ally of the UK and not a subject, a point driven home by the refusal to automatically declare war when the UK did but instead to wait for a parliamentary debate on the subject and declare war a week later. Therefore the military was prepared to act as an allied army and not as a subordinate part of the British army. Obviously this meant subordinating Canadian formations to higher level British formations but it was assumed that the Canadian formations would be the highest level possible that is to say multiple brigades would be a Canadian division and not parts of a UK division and similarly multiple divisions would be corps and not split into several UK corps
A lot of the governments hesitation about sending troops overseas and the focus on the air training plan was due to domestic politics and the residue of the WW1 controversies. This was exacerbated by a general election due in early 1940. Once the election was over and in particular once France was conquered the whole mood changed and the scope of the commitment changed quickly.