IMHO the French lost the ability to remove the Elite Companies after 1812.
Conscripts have already a hard time to keep pace with the more veteran Soldiers before even thinking about being used in ad hoc storming / Skirmisher Units.
So until the Campaign in Russia the French and the Nations with similiar Systems, like some Rheinbund Forces, would have been able to use the System of Building those Ad Hoc Battalions in the Field.
Who am I to argue about the possibility that those Fusiliers would have adapted the Austro/Prussian System of the 3rd Rank...I dont know.
I think that Barry said something about this when we played 2012 at Derby as we, the French Players, wanted to form storming parties to capture the Town in Front of us. I simply cant remember.
I was earlier very much a "Frog" as my Troops have been Westphalien
Now I can only talk about what I know about Saxons and this is not much
Btw., You are right, we didn't discuss this before.
It was only some posts in another thread where we blamed Clarence for the Skirmish Problem in RtE