I think Dallas will offer Ferg roughly the same deal they offered Schultz. Mid level TE contract. If he doesn't want it, then they got Schoon as a next year fallback.
Almost every long term big deal the Cowboys, and most teams do consist of a minimum base salary(based off # of years but say 1.2mil)+signing bonus proration.
The cap hits in 2025 even if they re-sign Parsons and Smith will be artificially low. They have a 90mil cap hit for Prescott that will.could be restructured. Since his base is 45mil, that's a lot of cap savings in the amount of ~36mil.
CDL also has a high base that can be restructured. They do not need that 23mil to re-sign and be under the cap alone.