I don't think Cooper Rush is the starter. Hell, I don't even think Cooper Rush is on the team next year. He'll cost a million or so if we keep him.
But there are several Vet QBs that will likely be available out there and there are several QBs in the draft that can be taken and groomed. I think it's possible to sign a QB and truth be told, if Dak sits out, then no cap is spent on Dak so plenty of money would be available to sign a viable QB in FA.
JMO
The trick to this is timing. If they're going to tag him, they've got to do it first day and take a read on what his agent will be advising. They would need to know whether to go for one of the vets or draft one and then have to balance that against him coming in.
If they tag him at 27.5M, they're pretty hamstrung on bringing in a Brady or a Rivers for 25-30M, they have to go with a rookie and good luck at 17. The top 3 QB's and that 3rd one is a stretch will be gone by the 6th pick.
If they decide to tag him, there is no way he holds out. A new offense is being installed and they're not going to teach that to him in season. He would be forfeiting $1,718,750 a game. Does anyone here think any player would do that? How many actually carry though a hold out for the season? Bell was the last to do that and that was a total fail and everyone in the league knows it.
If Prescott were to hold out a day, that would be the time to dump him as he's not the QB for this team. That's why it's not getting there. He will be signed and there will be a lot of pissed off posters here. I can't say I will be happy but I do understand the situation they're in and it's not like they didn't try to avoid this last season.
The amount of leverage an agent can apply is directly proportionate to the lack of options and the Cowboys have few unless they act quickly. If they can't get a deal, go for Rivers or maybe even Brady, and try to position in the draft for maybe Eason.