I agree with that. If the Salkinds had payed Brando to include his footage, I doubt there would have been as much demands and curiosity too see a Donner Cut. It still would have been different but his absence is the glaring hole in the released film. There are fan cut which combine both versions.
I am not happy with some of the choices made with the Donner Cut either. I am just happy we got any at all. Reading about those scenes for many years I figured we would never see any of it. I hate to say it but I remember my first thought when I heard Brando died. I suspected the door had opened for his footage to be released. His family would not have had the animosity toward the original situation and would be happy to get a fair and reasonable payment.