You are living in a fantasy world where the assumption is that dak saves them money and then the jones go out into free agency and spend said savings. This isn’t reality. The cowboys don’t want to spend money in free agency, because in free agency you typically have to over pay.
Stephen in particular sets a price for a player and if the player accepts it, they are signed, if they don’t then Dallas moves on. It’s a philosophy from the top of the organization to not be players in free agency and over pay.