But that is based on iotl Canadian relationship. We talking about Canada being the colonies administration from 1920s. ThAt means there be huge increase in interaction with Canada. The Canadians would of developed them differently and many people would of migrated to northern provinces. There be as good chance jamaica trinidD snd Guiana become provinces. It does not make sense to think interaction or outcome the same. Also the Canadians would of requested at least Ascension Island to gain access to falklands .
For one thing, Guyana was never a part of the West Indies Federation nor was ever mentioned as part of any proposals to expand Canada into the Caribbean, furthermore, the relationship between Canada and the Caribbean would fundamentally be an inequitable one and given the fact that conditions in the West Indies weren't exactly what you'd call good, there would still be an impetus for independence in most of the islands given that there would be limited mobility between the West Indies and the mainlands, territorial rather than provincial status and limited franchise coupled with the general desire for more autonomy and after WWII a path towards independence makes me rather skeptical of Canada both being committed to holding onto the islands and preventing their independence, and also not like Australia gave Papua New Guinea statehood or New Zealand annexed Samoa.
in regards to Ascension in the proposals, no mention is made of giving the Islands to Canada so ¯\_(ツ)_/¯ .