To put it quickly, your logic on this subject is much more questionable than mine. Why would the french-Armagnac party have said : "ok, let's give to the bourguignons what the english hold !" ????
I think you misread, maybe a bit too quick to hold out "your logic doesn't compute". If you read me carefully enough, you'd notice that I'm talking of territories that Bourguignons already controlled, as Champagne.
See, while Lancaster dominated a fair chunk of Northern France (Normandy, Part of Anjou and Ile de France), Bourguignons (both as a duchy and a party in France) dominated themselves large part of the regions even when it wasn't part of their dominion : Champagne, Somme, part of Ile de France etc.
Why the Armagnac party (that at this point wasn't considered as the French party : I already mentioned the
Diary of a Parisian Bourgoeis on this, that I must say is one of the most important contemporary sources on the Civil War and Lancastrian phase in Northern France. If you disagree, please gives something else than simple repetition) would have conceeded more than in 1435?
Well, that's quite easy : IOTL, they beneficied from military success and boost of power and legitimacy in Northern France. Basically they were in a favourable position.
ITTL, however, they would be in a disfavourable position (at least relatively) : a child pretender which would be out of question to sacre before a decade considering his age, forseeable heirs being held hostage by Lancasters (Charles and Jean of Orléans, to name them).
Granted, Philippe d'Orléans would be still among Armagnacs, but that would barely hide a really great problem of legitimacy if Louis XI dies, without even a bastard to be used.
Given that the obstacle that represented the murder of John of Burgundy disappears greatly with Charles VII's death, and that Armagnacs would be more interested to deal with Bourguignons at this point (would it be only to assure their flanks).
Bourguignons, having a better position ITTL to negociate, would probably continue to follow their main policies : expand their de jure domination whenever possible, something no longer doable with Lancasters, but with Armagnacs. On this regard, I'd think it may look like more as the 1414 Treaty of Arras, but with more important concessions than 1435 Treaty of Arras (that, I'm forced to point again, officiallized the de jure control of places that Bourguignons had taken over 15 or 20 years ago).
The fact is that people get what they can grab. Neither militarily, nor politically, not economically., the bourguignons did not have the means to grab more, not even to have more at the expense of the Lancaster controled area of France.
You doesn't seem to understand. Please take a look at the map I linked in my previous post, that (roughly) shows spheres or control or influences in 1419 France. Champagne, Somme, and basically North-Eastern France were already under Bourguignon control, not Lancastrian.
As for the impossibility to grab more, the IOTL development not only in the Empire, but as well in France prooves that it was actually very possible.
So all your point is devoid of plausibility and possibility : ASB.
And your's devoid of basic reading abilities, and sadly limited to repeat "Armagnac-French stronk".