First, tell me how much Dak is asking for and how much the Cowboys are offering. None of us know those numbers. Without those numbers, can't say who is right.
If Dak is asking for $40M/year, then see you and good luck with another team. Too many eggs in one basket.
1) If the Cowboys pay Dak $40M/yr what is the likely W/L record for the Cowboys? My guess is 6-10 to 9-7.
2) If the Cowboys pay a different QB (Dalton or Winston or someone else) at $15M/yr and add some extra players for $25M/yr, what is the likely W/L record for the Cowboys? My guess is 8-8 to 12-4.
So, I am not paying $40M/yr for Dak. Same scenario for $35M, $30M.
My max would be $30-32M. The Cowboy QB gets $7M in endorsements. Take it or leave it. I am betting no other team pays Dak $32M/yr.