>However, we may also note French entirely losing Indo-European
> declension yet it's not a "creole" and fully IE.
>
I don't get it. Do you understand 'creole' and 'IE' as mutually
exclusive? And BTW French is full of Germanic loanwords. The Frankish
upper class spoke a Germanic dialect, so French has passed through
the requisite sociological conditions for being creolized.