Usually very good to elite quarterbacks get top end money. Dak is not that quarterback. If Dak can get 28m then Mahomes should easily get 100 million a year. It's like comparing Rosie O'Donnel to Shakira. Besides that, you can count the teams on one hand that need a starting QB. Two of those teams will take one in the draft, who's left? I agree that last year he would have commanded a bigger contract because there were more teams in the market for starters.
Mahoms could be the first 40m and defiantly will come close to it. The price of elite goes up every year. Ryan with his 30m and Rodgers with his 33m set the new market for elite qbs. At this time there are only 3 that make 28m or more. If mahomes continues on this path and signs a Rodgers type deal after the 2020 season he would get 38.6m. With a work stoppage possible because the cba expiring could hamper that.
At the time Russell Wilson signed his contract he was not considered elite. He has a great defense and a great running game. That contract today with the cap would be 28.6m compared to 21.9m it was in 2015. He would even get more today because he's considered, by some and his numbers , elite.
As far as what he would get in the open market, he's get the 28m easily. 2 teams or 12 teams, he's get 28m. If they called elway today, he'd give us both his qbs and pay him 28m. If he was on the open market he wouldn't have traded for Flacco. Every year the market changes for teams who needs one.
I think people just look at other QBs and what they are making and put Dak in a certain group, and say he deserves that, without looking at when that contract was signed.